Variable inductometer type 14-G
1937
Variable condenser
1948
Variable condenser 14 picofarad
1936
Variable air condenser type A-430-BS 1100 picofarad no. 144006
Variable condenser
1936
Variable air condenser type A-430-B.M.S- 1000 picofarad no. 251104 by Muirhead and Co. Ltd.
1955