Strowger automatic telephone, 1901-1910
1901-1910
Lissen Headphones, 1922-1930
1921-1930
Model Disc Discharger, Marconi Company Souvenir, 1912
1912
Blank from which gear wheels are cut
Cable-code Telegraph Key
Railway chair wedge of laminated phenolic resinoid bonded sheet
Astatic Current Indicator (No 615) marked 'Crompton's patent' maded by R E Crompton & Co
circa 1878-1927
Machine castor with wheel cut from laminated phenolic resinoid bonded sheet
Bell type insulator
Three rods and three tubes of laminated phenolic
Strain insulator
Metal rods with covering of phenolic resinoid bonded paper
Battery case for surveying compass, British, 1913-1920
1913-1920