4 ms·
Looks like its US Patent No. 4441125 https://www.google.com/patents/US4441125 https://www.google.com/patents/US4441125
by enthdegree 13y ago
Looks like its US Patent No. 4441125
https://www.google.com/patents/US4441125 https://www.google.com/patents/US4441125