Post 1464 [1925-30]Photo courtesy Fred Astren. The 1/31/22 patent (printed in gutter) was issued to Herman Ritow.
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The page shown here is from the 1927 catalog. |
| For more information on Herman Ritow and Post "Ritow" slide rules,
click here.
These slide rules were made by Hoch, Huxhold & Hanneman in Hamburg. Rules identifed as "adjustable" use the DRGM 192052 friction adjusting mechanism. |