Producing Acoustic Time Signals By Electrical Means (for Mechanical Clocks Or Watches Subclasses 225 And 243) [g04c 21/00] Patents (Class 968/580)
Cross-Reference Art Collections
- By mechanically unlocking an electromechanical vibrator, e.g., actuated by the leakage flux of the electric driving means, etc. [G04C 21/18] (Class 968/589)
- By closing a contact to ring an electromechanical alarm [G04C 21/20] (Class 968/591)
- By closing a contact to put into action electro-acoustic means, e.g., awakening by music, etc. [G04C 21/28] (Class 968/596)
- With provision for a number of operations at different times, e.g., ringing the bells in a school, etc. [G04C 21/30] (Class 968/597)
- Devices on watches or similar portable timepieces [G04C 21/34] (Class 968/602)
- Signal-repeating devices [G04C 21/36] (Class 968/603)
- Adjusting the duration of signals [G04C 21/38] (Class 968/604)
There are no patents to show for this class.