"Electric relays. Constructional details and notes on the use of magnetic, mercury, thermionic & photo/electric relays. With IIO diagrams and photographs."
ROSSLYN(J)
"Electric relays. Constructional details and notes on the use of magnetic, mercury, thermionic & photo/electric relays. With IIO diagrams and photographs." - London "George Newnes Ltd.," 1942 - vii p. + 184
"Electric relays. Constructional details and notes on the use of magnetic, mercury, thermionic & photo/electric relays. With IIO diagrams and photographs." - London "George Newnes Ltd.," 1942 - vii p. + 184