Inventor
SAKUMA FUMIO
8 patents
⚠️ This page may combine multiple inventors who share the name “SAKUMA FUMIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
YAMAMOTO ELECTRIC IND CO LTD
6 patentsUS4251796AFeb 17, 1981
Slide-type potentiometer
YAMAMOTO ELECTRIC IND CO LTD12 citations71
US4246521AJan 20, 1981
DC Motor speed control system
YAMAMOTO ELECTRIC IND CO LTD9 citations71
US4168455ASep 18, 1979
Motor speed control system
YAMAMOTO ELECTRIC IND CO LTD17 citations70
US4085692AApr 25, 1978
Motor control apparatus for electrically-driven sewing machine
YAMAMOTO ELECTRIC IND CO LTD2 citations60
US4143605AMar 13, 1979
Motor driven sewing machine
YAMAMOTO ELECTRIC IND CO LTD4 citations59
US4142472AMar 6, 1979
Control apparatus for an electrically driven sewing machine with stitch pattern producing device
YAMAMOTO ELECTRIC IND CO LTD4 citations59