Details
A black-enamelled and lacquered-brass mining air-flow meter,
by Casella London, with silvered dial, eight aluminium-bladed impellor, with specification leaflet, in the original leather carrying case -- 4.1/8in. (10.5cm.) wide
by Casella London, with silvered dial, eight aluminium-bladed impellor, with specification leaflet, in the original leather carrying case -- 4.1/8in. (10.5cm.) wide