Horizontal T-square indicator

Details Horizontal T-square indicator Horizontal T-square indicator

1991-08-19

1993-06-15

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03364429

REFERENCES:
patent: D243664 (1977-03-01), Lyon
patent: D285540 (1986-09-01), Allen
patent: D302124 (1989-07-01), Bevins
patent: 594803 (1897-11-01), Kustel
patent: 609363 (1898-08-01), Oliver
patent: 1442143 (1923-01-01), Goldblatt
patent: 1560482 (1925-11-01), Noisdu
patent: 1645699 (1927-10-01), Gullborg
patent: 4616423 (1986-10-01), Shephard

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