Dates for Series F
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A limited number of copies of the AMERICAN DIGEST OF BUSINESS MACHINES (1924) is available.  Use the link on the home page to find out how to get your copy.

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Dates for Series F Dates for Series 20-30 Dates for Series 100-300 Dates for Series J Dates for Portables Age by Serial Number Model / Serial Cross Reference

Manufacture Dates For Series F Bookkeeping Machines

YearSerial Start
1949A940700
1950A971418
1951B82091
1952B237501
1953F5750P
1954F16230P
1955F25621P
1956Unavailable

Courtesy of the Charles Babbage Institute, University of Minnesota, Minneapolis