Desk letter scale

Details Desk letter scale Desk letter scale

1990-03-12

1992-12-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

Patent

active

D03317137

REFERENCES:
patent: D172909 (1954-08-01), Stelzer
patent: D181891 (1958-01-01), Walborn
patent: D201044 (1965-05-01), Ruskin
patent: 2523342 (1950-09-01), Thurstone et al.
patent: 4368791 (1983-01-01), Jackson

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