Yale Quad N time lock with Yale No. 1 automatic bolt motor, c.1890 @MarkFrankclocks
Yale Quad N time lock with Yale No. 1 automatic bolt motor, c.1890 @MarkFrankclocks
Uploaded September 2018 | Updated September 2026, 2 weeks ago
A demonstration of the Yale model Quad N time lock mounted to a Yale No. 1 automatic bolt motor. Both the Quad N and No. 1 bolt motor were Yale's largest and meant for the largest vault doors.
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Yale Quad N time lock with Yale No. 1 automatic bolt motor, c.1890

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