Geometrical instruments – Straightedge type – Rules
Patent
1978-07-24
1980-04-15
Phillips, Charles E.
Geometrical instruments
Straightedge type
Rules
33 32R, B43L 700, B43L 1300
Patent
active
041976495
ABSTRACT:
A linear marking device is provided comprising a ruled straight edge having transparent properties and constructed with a marking implement groove and unique surface gripping strip.
REFERENCES:
patent: 185102 (1876-12-01), Hays
patent: 556582 (1896-03-01), Maier
patent: 2016985 (1935-10-01), Carlson
patent: 2736097 (1956-02-01), Coleman
patent: 2908081 (1959-10-01), Burke
patent: 3178826 (1965-04-01), Aisen
patent: 3439426 (1969-04-01), Wilson
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