Magnetomotive metal working device Patent
Portable magnetomotive hammer for metal working
Foster, L. E.↗
Engineering topics
Foster, L. E.
Publications and source records attributed to Foster, L. E..
Compact SCR trigger circuit for ignitron switch operates efficiently
Trigger circuit with two series-connected SCR triggers an ignitron switch used to discharge high-energy capacitor banks. It does not require a warmup period and operates at relatively high efficiency.
Foster, L. E.↗