Light responsive photo-optical keyboard
United States Patent 3056030
US Patent References:
Burglar alarm system
- - 2220427

Keyboard control system
- - 2432527


Inventors:
Kelchner, Harley E.
Publication Date:
09/25/1962
View Patent Images:
Download PDF 3056030 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
BURROUGHS CORP
Primary Class:
250/229
Other Classes:
400/477, 250/221, 178/17D, 341/31, 400/479
International Classes:
H03K17/969; H03K17/94