Letter weighing device

Details Letter weighing device Letter weighing device

1993-04-20

1995-01-10

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

Patent

active

D03542459

REFERENCES:
patent: D23335 (1894-06-01), Withrow
patent: D233658 (1974-11-01), Schroeder
patent: D250935 (1979-01-01), Lokuig
patent: 1201063 (1916-10-01), Litchfield
patent: 2204595 (1940-06-01), Hotson
patent: 2507073 (1950-05-01), White
patent: 2612365 (1952-09-01), Nielson
patent: 3224516 (1965-12-01), Stelzer
patent: 4961472 (1990-10-01), Pratt

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