Title:
Means for keeping up the oscillations of pendulums
United States Patent 1933087

Inventors:
Constant, Battegay
Publication Date:
10/31/1933
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Assignee:
Brille, Freres Des Atel SA.
Primary Class:
368/165
Other Classes:
368/134, 368/179, 968/454
International Classes:
G04C3/02; G04C3/00