Calculating device

Details Calculating device Calculating device

1989-11-20

1991-11-26

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

434203

Patent

active

D03219062

REFERENCES:
patent: 2457332 (1948-12-01), Wade et al.
patent: 2654164 (1953-10-01), Seidenberg
Kurtz Bros., 1973/74, p. 264, #8 "Counting Frame".

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