Title:
INSTRUCTIONAL DEVICE
United States Patent 3461572


Inventors:
Schmidt, Arthur D.
Shuert, Keith L.
Application Number:
US3461572DA
Publication Date:
08/19/1969
Filing Date:
10/27/1967
Assignee:
Oakland, Community College
Primary Class:
Other Classes:
235/70R, D19/62
International Classes:
G09B19/02; (IPC1-7): G09B19/02; G06G1/02; G09B1/28
View Patent Images:
US Patent References:
2925750Music transposing scale computer1960-02-23
2422421Slide rule1947-06-17
0651142N/A1900-06-05