Ear Trumpets, Audiphones, Dentaphones, Speaking Tubes, Artificial Ear Drums, Micro-audiophone
61 patents with full text and illustrations scanned at high resolution for printing and indexed by date and inventor for easy retrieval
61 patents in Acrobat format
Adobe Acrobat reader for windows is included on the CD-ROM
Acrobat for other platforms is available free on the Adobe website
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