Sound Powered Telephone Extension Signal Devices

Description
Dynalec Part Number
→ Howlers
For use with TA-974/WTC-2(V) or TA-975/WTC-2(V) Telephone Sets
For use with IC/D and Type A541 through A546 Call-Signal Stations
   
→ Extension Relays
For use with TA-974/WTC-2(V) or TA-975/WTC-2(V) Telephone Sets only
For use with IC/D and Type A541 through A546 Call-Signal Stations
 
→ Visual Devices
115 VAC, 50 watt lamp; white globe