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Class Information
Number: 968/841
Name: Horology > Apparatus for measuring unknown time intervals by electromechanical means [g04f 8/00] > Using an electromechanical oscillator (subclasses 817 and 844 take precedence) [g04f 8/02] > Using a piezoelectric oscillator [g04f 8/04]
Description:


Patents under this class:

Patent Number Title Of Patent Date Issued
4211066 Stop watch Jul. 8, 1980
 
 
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