Gas meter diaphragm, unoiled, made from the skin of an East Indian tick-free sheep, c.1976. Gas meter diaphragm 1976
Gas meter diaphragm made from the skin of an East Indian tick-free sheep and dressed with mineral oil, c.1976. Gas meter diaphragm made from the skin of an East Indian tick-free sheep and dressed with mineral oil 1976
Commercial gas meter diaphragm in polyacrylonitrile-butadiene rubber on a flat-woven polyamide fabric, c.1976. Commercial gas meter diaphragm in polyacrylonitrile-butadiene rubber on a flat-woven polyamide fabric 1976
Commercial formed gas meter diaphragm in Polacrylo-nitrile-butadiene rubber, (Metflex) on polyester-fabric, c.1976. Commercial formed gas meter diaphragm in Polacrylo-nitrile-butadiene rubber 1976