Model 1439 [1910] appears to be same as Dennert & Pape model 19 (1914-19 D&P Catalogs)
"Adjustable" means the rule uses the D&P DRGM 192052 friction adjusting mechanism.
| No specimen scans available. |
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| Model 1438 [1910] appears to be same as Dennert & Pape model 17
(1914-19 D&P Catalogs)
Model 1439 [1910] appears to be same as Dennert & Pape model 19 (1914-19 D&P Catalogs) "Adjustable" means the rule uses the D&P DRGM 192052 friction adjusting mechanism. |