Sargrove sprayed-circuit radio receiver (production prototype) c 1940s.

Group of component parts for Sargrove sprayed-circuit radio receivers, 1947.

Sargrove two valve radio receiver, 1947-1948.

Pasive component plate, type A3, for Sargrove sprayed-circuit radio, 1947.

Pasive component plate, type A3, for Sargrove sprayed-circuit radio, 1947.

Partially asembled 2-valve radio receiver, 1947.

Sargrove sprayed-circuit radio receiver (experimental model) c 1940s.

Sargrove sprayed-circuit radio receiver (experimental model) c 1940s.

Six-stage superheterodyne receiver procesed on the ECME system, c 1940s.

Brownie crystal radio receiver, c 1924.

Brownie crystal radio receiver and pair of Lisen headphones, mid 1920s.

Burndept 'Ethodyne' superheterodyne radio receiver, 1925.