Noise-Cancelling Telephone Apparatus P-452 for Battery-Free Shipboard Communication

Nomenclature of telephone sets to devices of battery-less intra-ship communication (Telephone sets P-452) according to TU5-72 KK0.210.028 TU:
- Telephone set with anti-noise telephone handset MTF STA1
- Telephone set with headphone or microphone MTF1STA2
- Telephone set with normal handset MTB STA3
- Headset with belt headband and chest microphone TGF
- Headphone with summer helmet and chest microphone TLSHF
- Headset with winter helmet with chest microphone TZSHF