• All sections
• G - Physics
• G04C - Electromechanical clocks or watches
• G04C 21/32 - Producing acoustic time signals by electrical means producing the signals at adjustable fixed times with provision for a number of operations at different times, e.g. ringing the bells in a school giving indications at a number of places, each at a different time, e.g. system of alarms in a hotel

Patent holdings for IPC class G04C 21/32

Total number of patents in this class: 1

10-year publication summary

Principal owners for this class