Illumination – Revolving
Patent
1975-11-17
1978-02-21
Braun, Fred L.
Illumination
Revolving
362109, F21V 3300
Patent
active
040754677
ABSTRACT:
A drafting instrument using an internal light source to illuminate, via mirrors and glass beads and a plastic blade, the work area usually shaded by the draftsman, especially in the form of a T-square.
REFERENCES:
patent: 2643326 (1953-06-01), Knapp
patent: 3241256 (1966-03-01), Viret et al.
Braun Fred L.
Criddle B. Deon
Wong Peter S.
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