Automatic following system
United States Patent 2403975
Inventors:
Graham, Robert E.
Publication Date:
07/16/1946
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Export Citation:
Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
Other Classes:
318/480, 250/214R, 250/203.500, 89/41.060
International Classes:
G01S3/786; G01S3/78