Folding ruler measuring device

Details Folding ruler measuring device Folding ruler measuring device

1997-02-12

1997-12-16

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D03876896

REFERENCES:
patent: D166938 (1952-08-01), Richardson
patent: 496123 (1893-04-01), Keuffel
patent: 580918 (1897-04-01), Willcox
patent: 1969988 (1934-08-01), Neuberg
patent: 2555741 (1951-06-01), Greene
patent: 4268967 (1981-05-01), Brana et al.

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