Telegraphic block instrument
- Made:
- London
Telegraphic block instrument, non-Western Region Tyer's No.11 train key staff apparatus, unnumbered with 1 key token, Ardgay / Lairg, by Tyer's & Co., London.
Telegraphic block instrument, non-Western Region Tyer's No.11 train key staff apparatus, unnumbered with 1 key token, Ardgay / Lairg, by Tyer's & Co., London.