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Pye service valve tester

Valve tester by Bistorf and Funke

1939-1945

Avocet 333 Type IV electronic valve tester

1960-1969
Mullard high-speed valve tester. c.1955.

Mullard high-speed valve tester

1955
Mullard high-speed valve tester, with two metal boxes of perforated cards

Mullard high-speed valve tester