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Tyers Permissive Block Instrument
In excellent used conditionRotary commutator released by plunger on right hand side of instrumentWindow shows positions Line Closed/Line Clear/Train on Line/2-6See photos
Collection preferred (from Hitchin or South Cambridgeshire) to avoid risk of damage but can be sent courier
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Category: Collectables:Transportation Collectables:Railwayana:Hardware Railwayana:Other Hardware Railwayana
Location: Hitchin, Hertfordshire