1 Matching Results
Results open in a new window/tab.
Results:
1 - 1 of
1
Apparatus for Transmitting Sound-Waves
Patent for transmitting sound waves by magnetic induction and to "furnish an apparatus by which these different vibrations can be heard at the receiving end" (lines 20-22). Includes descriptions and illustrations.
Date:
October 17, 1911
Creator:
Harvey, Fred Brown
System:
The Portal to Texas History