Building square

Details Building square Building square

1995-09-18

1998-09-15

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D03982521

REFERENCES:
patent: 233618 (1880-10-01), Herzog
patent: 1838607 (1931-12-01), Zerbel

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