Box with acoustics equipment. Including 2169A "Contacts adjustable" and 3118B "Contact carbon". Box with acoustics equipment
Acoustics Equipment, marked NR15A. The box reads as follows:“The Pattern number shewn on this slip is the new designation of the Valve enclosed. Supplies should be taken on charge, and demanded, under the new pattern number in future. S.N.S.O. Haslemere December, 1943.”, (52-6296) Acoustics Equipment, NR15A 1944
Acoustics equipment, NR 43. The box reads NR43, Pat 3704, pencil – OK NR 43, 30/1/45. Acoustics equipment 1945