Automatic chalkline

Details Automatic chalkline Automatic chalkline

1987-06-29

1991-01-08

Dunkins, Bruce W.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03135616

REFERENCES:
patent: 947892 (1910-02-01), Eastman
patent: 978064 (1910-12-01), Sayles
patent: 1098033 (1914-05-01), Friendship
patent: 1609777 (1926-12-01), Senez
patent: 3309089 (1967-03-01), Doyle
patent: 3427724 (1969-02-01), Tracy
patent: 4662078 (1987-05-01), Gammon et al.

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