Reusable chalkboard graphing stencil

Details Reusable chalkboard graphing stencil Reusable chalkboard graphing stencil

1998-06-03

1999-12-28

Holtje, Martie K.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Guide

D19 35, 1906

Patent

active

D0418162&

REFERENCES:
patent: D32159 (1900-01-01), Nisbet
patent: D267725 (1983-01-01), Sidrak
patent: D278068 (1985-03-01), Sager
patent: 830282 (1906-09-01), Andrews
patent: 1293313 (1919-02-01), Berkoff
patent: 1662882 (1928-03-01), Clark
patent: 3376650 (1968-04-01), Cook
patent: 3857184 (1974-12-01), Burkin et al.
patent: 4599798 (1986-07-01), Steele
patent: 5076612 (1991-12-01), Nirmel
patent: 5282317 (1994-02-01), Carter et al.

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