Portable bridge type 21-A no. 98604, by Muirhead and Co. Ltd., January 1940 Portable bridge type 21-A no. 98604
Three French telephone cards (telecartes): Serial Nos. B0602C and 9066f, one without serial no. depicting Vincent Van Gogh Three French telephone cards (telecartes): Serial Nos. B0602C and 9066f
Variable air condenser type A-430-B.M.S- 1000 picofarad no. 251104 by Muirhead and Co. Ltd., March 1955 Variable air condenser type A-430-B.M.S- 1000 picofarad no. 251104 by Muirhead and Co. Ltd.
Experimental microphone having two contacts between carbon blocks Experimental microphone having two contacts between carbon blocks