Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Specification of Edward Collier : ear dilators. Public Domain Mark. Source: Wellcome Collection.
Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Specification of Edward Collier : ear dilators. Public Domain Mark. Source: Wellcome Collection.
Patent for a device (which "consists of a piece of silver tube with a funnel mouth") intended to improve poor hearing
Location | Status | Access | |
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Closed stores Pat. vol. 27 |
Location | Access | ||
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Closed stores Pat. vol. 27:35 |