Ball coherer or detector, Branly collection. Other numbers are A182851 and B3934. Ball coherer or detector
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