Four-way ruler

Details Four-way ruler Four-way ruler

1995-09-07

1996-08-20

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03728765

REFERENCES:
patent: D245071 (1977-07-01), Kong
patent: D312419 (1990-11-01), Kang
patent: D312976 (1990-12-01), Holterscheidt
patent: 5430952 (1995-07-01), Betts

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