Obstruction square

Details Obstruction square Obstruction square

1993-07-06

1994-06-21

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03480151

REFERENCES:
patent: 134919 (1873-01-01), Moore
patent: 217967 (1879-07-01), White
patent: 2802278 (1957-08-01), Knefel
patent: 3492715 (1970-02-01), Maton
patent: 4338725 (1982-07-01), Martin et al.
patent: 4736525 (1988-04-01), Deason
patent: 4773163 (1988-09-01), Wolford, Jr.
patent: 4805315 (1989-02-01), Nesbitt
patent: 4914825 (1990-04-01), Howard

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