Proprietà:Invented by

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Patent-GB-269614.pdf +

Emanuel Feldorf +, Peter Andresen +, Gertrude Ellen Wade +

Patent-GB-270915.pdf +

Theodor Kovacs +

Patent-GB-273357.pdf +

Lionel Gunsberg +, Emanuel Feldorf +

Patent-GB-283677.pdf +

Alfred Finburgh +, David Finburgh +, Alexander Finburgh +

Patent-GB-284412.pdf +

Charles Gerald Stephens +, Frank Carr Fincham +