A Boncard hearing aid with a 15-volt Australian made battery about one third the size of a cigarette packet. American makers of hearing aids are hailing the invention of a battery about half the size of their cigarette packets as a revolution in better hearing for the deaf aids have been on sale here for nearly 12 months. January 30, 1950.

A Boncard hearing aid with a 15-volt Australian made battery about one third the size of a cigarette packet. American makers of hearing aids are hailing the invention of a battery about half the size of their cigarette packets as a revolution in better hearing for the deaf aids have been on sale here for nearly 12 months. January 30, 1950.
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DETAILS
Image Number: 5513-18655047Rights ManagedCredit Line:Sydney Morning Herald/SuperStockCollection:Sydney Morning HeraldContributor:Sydney Morning HeraldModel Release:NoProperty Release:NoResolution:2469×1894
1950
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