8 Utility Patents
#57 in Park Ridge, IL
#9,659 in Illinois
#254,223 in US
#520,178 in the World
Forward Citations = 166
Company Filing History:
Conversion Sound Inc.
Chicago Custom Acoustics, Inc.
Beltone Electronics Corporation
4. 1 out of 3
Sigmedics, Inc.
5. 1 out of 1
Belltone Electronics Corporation
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