TH - Telegraph apparatus
- TH-1/TCC-1
- TH-2
- TH-3
- TH-4
- TH-5/TG
- TH-6
- TH-7
- TH-8
- TH-9
- TH-10
- TH-11/
- TH-12
- TH-13
- TH-14
- TH-15
- TH-16
- TH-17
- TH-18
- TH-19
- TH-20
- TH-21/
- TH-22/TG
- TH-23
- TH-24
- TH-25
- TH-26
- TH-27
- TH-28
- TH-29
- TH-30
- TH-31/
- TH-32
- TH-33
- TH-34
- TH-35
- TH-36
- TH-37
- TH-38
- TH-39
- TH-40
- TH-41/
- TH-42
- TH-43
- TH-44
- TH-45
- TH-46
- TH-47
- TH-48
- TH-49
- TH-50