Title:
MANUAL ELECTRONIC KEYBOARD
United States Patent 3464531
Inventors:
Herr, Edward R.
Sumrall, George E.
Publication Date:
09/02/1969
Other Classes:
400/491.200, 310/339, 200/181, 400/481, 341/34, 310/330
International Classes:
H03K17/96; H03K17/967; H04L13/16; H03K17/94; H04L13/00; H01V7/00; B41J5/08; B41J5/16