Three items in polyvinyl chloride (PVC), c. 1976 Three items in polyvinyl chloride (PVC), c. 1976 1976
Detached items as follows : shafts, with some parts of wheel; remaining arms and braces of wheels [no stand rings etc]; winding winch. Four iron hooks to connect bellows to counterweights set of detatched items
A group of forty items relating to Hydrogen Fabric Porosity permeo-meters. Items relating to Hydrogen Fabric Porosity permeo-meters 1941