Baseball card grade gauge

Details Baseball card grade gauge Baseball card grade gauge

1989-06-21

1990-11-13

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03120481

REFERENCES:
patent: 946483 (1910-01-01), Blair
patent: 1587133 (1926-06-01), Anhof
patent: 1914127 (1933-06-01), Huebner
patent: 2806299 (1957-09-01), Dubas
patent: 3266162 (1966-08-01), Burke
patent: 3760506 (1973-09-01), Tudberry
patent: 3832785 (1974-09-01), Miller
patent: 4132000 (1979-01-01), Dulude
patent: 4607433 (1986-08-01), Meeker
patent: 4704796 (1987-11-01), Gauer
patent: 4734993 (1988-04-01), Pan

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