Smiths Relay Pumping Indicator - AA/3131

Vintage / Rare Fire Brigade Equipment Relay Pumping Indicator  Scale appears to be in Hose Lengths Small box about 17cm square with hinged lid. There is a small (1cm) port at the bottom.The dial is 12cm across Has carry strap. Made by Smith Industries.Appears to respond to changes in barometric pressure. - AA/3131

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