Title:
Automatic following system
United States Patent 2403975
Inventors:
Graham, Robert E.
Publication Date:
07/16/1946
Export Citation:
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
348/169
Other Classes:
89/41.06, 250/203.5, 250/214R, 318/480
International Classes:
G01S3/786; G01S3/78
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