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The carbon transmitter was used to amplify sound by taking a weak signal and using electric current to make it a strong signal.One of the first manufacturers of the electronically amplified hearing aid was the Siemens company in 1913.Collapsible conical ear trumpets were made by instrument makers on a one-off basis for specific clients.

This drive toward ever increasing invisibility was often more about hiding the individual's disability from the public than about helping the individual cope with his problem.Rein pioneered many notable designs, including his 'acoustic headbands', where the hearing aid device was artfully concealed within the hair or headgear.Reins' Aurolese Phones were headbands, made in a variety of shapes, that incorporated sound collectors near the ear that would amplify the acoustics.After the signal was converted, it would be amplified when it moved to the receiver.The hearing aid weighed seven pounds, which made it light enough to be carried.

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