Description:
1874 - Ernst W. Siemens was the first to describe the ",dynamic", or moving-coil transducer, with a circular coil of wire in a magnetic field and supported so that it could move axially. He filed his U. S. patent application for a ",magneto-el
Hits:
99 |
Rating:
( 5.0 )
by 1 users
Added:
8/20/2002
