Quilting ruler

Details Quilting ruler Quilting ruler

1987-11-13

1990-11-06

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03118738

REFERENCES:
patent: D199807 (1964-12-01), Wilson
patent: D283986 (1986-05-01), Sogorka
patent: 289512 (1883-12-01), Darling
patent: 317188 (1885-05-01), Pederson
patent: 731311 (1903-06-01), Leavell
patent: 1226855 (1917-05-01), Boynton
patent: 4531303 (1985-07-01), Jones
patent: 4641436 (1987-02-01), Tzen et al.
patent: 4750270 (1988-06-01), Kundikoft

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