Robert J. Spercel

📍 Cleveland, OH: #248 of 1,781 inventorsTop 15%

🗺 Ohio: #13,499 of 73,341 inventorsTop 20%

Overall (All Time): #890,000 of 4,157,543Top 25%

Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #	Title	Co-Inventors	Date
5381715	Tuning device	—	1995-01-17
4625614	Tuning device	—	1986-12-02
D267410	Guitar string tuning device housing	—	1982-12-28
4353280	Tuning device	—	1982-10-12
D256471	Guitar string tuning machine	—	1980-08-19
4191086	Tuning device	—	1980-03-04