Tablet Instrument; Tyers patent permissive slide release plunger; metal cased instrument on wooden stand Tyers patent permissive slide release tablet instrument
Train tablet instrument,Tyers No 6 type, wooden and metal case, painted green. Tyers no 6 tablet instrument
No.5 absolute and permissive tablet instrument, pattern B2075, by Tyer & Company. No.5 absolute and permissive tablet instrument
Tyers no.1 train tablet instrument, with galvanometer gong and four tablets. Tyers no 1 tablet instrument
Intermediate siding tablet instrument pattern B2085, Tyers No. 7, by Tyer & Company Intermediate Siding Tablet Instrument
Intermediate tablet instrument, Tyers No. 7, no provenance. Intermediate Tablet Instrument, Tyers No. 7