Frederick Post Slide Rule Cross Reference                              
This chart lists all "Frederick Post" brand slide rules by model number and by when they were sold.  Post never manufactured their own slide rules but they were a vigorous seller of other manufacturer's rules--some under the "Frederick Post" name and some under the original manufacturer's name.   This cross reference is concerned only with rules that were sold under the Frederick Post name.  

I use the words "model number" and "catalog number" interchangeably for Frederick Post brand items.  (For non-Frederick-Post brand items the catalog number assigned by the Post Company has no relation to the model number assigned by the original manufacturer.  Post catalogs rarely mention the original manufacturer's model number.)     

     
                             
This chart lists model number in horizontal rows and dates in vertical columns.  A grey cell indicates that I don't think Post was selling any rules with that model number that year.  Click on any white or green cell to learn all I know about that particular slide rule at that particular time.  I try to show the catalog entry, a scan of a specimen rule, the original manufacturer's name and model number and anything else I found interesting. 

                             
Credits: Ted Hume was coauthor of the original research back in the 20th century.  Peter Holland provided all the information about Dennert and Pape and urged me to publish the results.  Georg Schreiber provided all the information about Koch, Huxhold & Hannemann whose rules I had confused with Dennert & Pape.  I apologize to the many persons who provided material but received no credit because I have forgotten their names.

                             
This Cross Reference is prepared with Microsoft Excel; it's the only program I understand that produces Web content on this scale.  Unfortunately, the output seems to look right only with Internet Explorer.  If you use another web browser (I mostly use Google Chrome) you might try Internet Explorer for this page.  You may need to use the "zoom" feature on your browser to  get a good view of all the cells at once.
Paul Ross
                             
Manufactured by Dennert & Pape
 from before 1903 to c1917
Manufactured by Nestler, KHH and, possibly, others from c1920 to 1924 Manufactured by Koch, Huxhold & Hannemann from 1925 to 1930 Manufactured by Hemmi Seisakusho
 from 1931 to 1941
Manufactured by The Roos Company and Grafton Plastics from 1942 to c1946 Manufactured by Hemmi Keisanjaku KK ("Hemmi Bamboo Slide Rule Mfg Co. Ltd.")
  from c1947 to c1975
   
Model No. 1903 1910 1921 1922 1923-24 1925 1927 1930 1932 1936 1937 1940 1942 1944 1945? 1949 1955 1960 1963 1966 1969 1971 Teledyne 1972+    
1410                         1410                   44BB-100 10-Scale Beginners  
1414                         1414                   44BB-140 13-Scale Beginners  
                                              44BB-150 9-Scale Beginners  
1420                         1420                   44CB-200 Darmstadt    
1422                         1422                   44CB-220 Rietz    
1426                         1426                   44CB-260 Commerce    
1431   Adjustble 5"                     1431                          
1432   Adjustble 10"                     Models in aqua below were "Temp Dsctd" in 1942           Oval Callout: Green background indicates a likely catalog omission.  Dates are estimates.
 
             
1433   Adjustble 20"                                              
1434    Engineer's 10"                                              
1435   Eureka 5"                                              
1436   Eureka 10"                                              
1437   Nautical 10"            
 
4" with Vertical Top Edge 1437                          
1438   Logarithm 10"               5" Mannheim Multiphase 1438                          
1439   Vicari Sewer                     1439                          
1439D       Midget _Circular         "     1439D                          
1440 Engineer's 10"         High School 10" Celluloid Indicator   4" Mannheim 1440                          
1441 Improved Engineers 10"                 4" Mannheim w Mag Lens  1441     4" Vest Pocket with Magnifying Lens    Mini-Versal 44DA-410 4" Vest _Pocket  
1442 Improved Engineers 20"       5" Pocket High School 10" Glass Indicator         1442   5" "Dual"                      
1443 Imprvd Engnrs on metal       10" Studnt       5" Extra Thin 1443                          
1444     10-inch Mannheim Student 10"  (1440 plus S & T)   5" thin Multiphase 1444                
1444
       
1444A     Probably non-existent 10" Reitz                1444A                          
1444C     Probably non-existent                 1444C                          
1444D                         1444D 5" "Commerce"                       
1444K                     5" with CI and K 1444K     5" Pocket Slide Rule   1444K 44DA-440 5" Pocket    
1444P                         1444P 5" Plastic                      
1445                 5" Thin w Folded Scales 1445               8" Student  44BA-450 8" Studnt    
1445P                         1445P             8" Student Plastic           
1446           Student 10" (1442 plus S & T)  10"   Student Mannheim 1446
 
10" Student 10" Student                    
1446D                         1446D 10" Student                        
1447                 4" flat lens       1447  
10" Student
10"  Student with CI and K Scales  44BA-470 10" Studnt    
1447A                 Same 1437       1447A                          
1447D                         1447D   10" Student  Demonstration                
1447DA                         1447DA     Large Demonstration                
1447DP                         1447DP               Projecton _Student 44AA-47R Projecton    
1447M                 4" Magnfy       1447M                          
1447P                         1447P             10" Student Plastic           
1448           Mannheim Adjustable 5-inch 5"    Mannheim    1448                          
1449           Mannheim Adjustable 10-inch 10" Mannheim 1449                          
1449T                     Thin 10" Mannheim 1449T                          
1450           Mannheim Adjustable 20-inch   20"  Mannheim 1450               Versatrig 44CA-500 Versatrig    
1450DP                         1450DP               Projecton _Verstrig 44AA-50R Projecton    
1451                   5" Universal 1451             Pocket_ VersaTrig          
1452           Mannheim Multiphase Adjustable 10" 10" Universal 1452     Universal          
1452
       
1452D                         1452D 10" Universal                      
1452P                         1452P   10" Plastc                      
1452T                     10" Thin 1452T                          
1452W                         1452W       Wide  Universal   1452W 44BA-520 Universal    
1453                   6" Extra Fine 1453                          
1454           Mannheim Multiphase Adjustable 20"   20" Universal 1454                          
1455                   10" w Folded Scales 1455                          
1456           Electrical Slide rule 10" 10" Electrical 1456                          
1457                         1457   Mannheim _Trig                    
1458           Multiphase Duplex 10" 10" Universal Duplex  1458                          
1459                 10" Log Log Duplex 1459                          
1460           Ritow 10" High School     20" Electrical Duplex 1460       Versalog "IA" Versalog "1B" Versalog II 44CA-600 Vrsalog II    
1460DP                         1460DP               Projecton  _Versalog  44AA-60R Projecton    
1461                   10" De Luxe Duplex 1461       Pocket_ Versalog Pocket Versalog 1B   Pkt Vlog II 44DA-610 Pkt Vlog II    
1462           Ritow 10" High School _Upgrade         1462   Power-Trig                      
1462H                         1462H     Postrig                    
1463           Ritow 10" Student _Manifold   1463   Midget Circular     1463   Midget Circular   44EA-630 Midget    
1464           Ritow 5" Manifold Adjustable         1464     Binary Circular   44EA-640 Binary    
1465           Ritow 10" Manifold Adjustable          1465         Atlas Circular   44EA-650 Atlas    
1466           Ritow 20" Manifold Adjustable         1466                          
1468           Ritow 10" Manifold Duplex                                      
1470           Ritow 10" Manifold  _Simplex                                    
1471           Ritow  10" Merchants Log Log _Adjustable   Click for information about the tables on the backs of closed body slide rules.                  
1472           Ritow 20" Merchants Log Log _Adjustable                                    
1473           Ritow 10" Merchants Log Log _Simplex   Click for information about trigonometric scales and scale sets like "Mannheim" and "Rietz."                  
1474           Ritow 20" Merchants Log Log _Simplex                                    
1475           Ritow Cylindrical                                      
1490                         1490         Control Engineering            
1491                         1491         Chem Rule            
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