Radio tuning coil No. 75, 1922-1923
1922-1923
One set coils, 75, 100, 150, 200, 300, 400, (in section), 500, 750, and 1000. Burndept Limited, Blackheath, 1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923