Patent

Patent:US1566628 22.12.1925 Stosick, Edmund C. Durant (P) Mfg. Co. : Counter
Patent:US2140839 20.12.1938 Hennessy, Mark M. Durant (P) Mfg. Co. : Counter
Patent:US2444570 06.07.1948 Lawrence, Harold J.; Hennessy, Mark M. Durant (P) Mfg. Co. : Drive for counter numeral wheels
Patent:US2451084 12.10.1948 Hennessy, Mark M. Durant (P) Mfg. Co. : Locking and resetting means for counters
Patent:US2781976 19.02.1957 Walter W. Hoffmann Durant (P) Mfg. Co. : Predetermining counter
Patent:US2980329 18.04.1961 Walter W. Hoffmann Durant (P) Mfg. Co. : Counter resetting means
Patent:US2996241 15.08.1961 Walter W. Hoffmann Durant (P) Mfg. Co. : Resettable counter wheel units

Rechnerlexikon