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Francis S. Humphrey

Leitersburg, MD: #1 of 1 inventorsTop 100%

Maryland: #19,431 of 35,612 inventorsTop 55%

Overall (All Time): #4,102,422 of 4,157,543Top 100%

1 Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4306115	Automatic volume control system	—	1981-12-15