• All sections
• G - Physics
• G04C - Electromechanical clocks or watches
• G04C 21/22 - Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm put into action by the arbor of a mechanical alarm work

Patent holdings for IPC class G04C 21/22

Total number of patents in this class: 1

10-year publication summary

Principal owners for this class