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1 = patch field, 4 = mixing desk, 6 = R. Verschoor: modified Revox G 36 with ‘translation’ head set and variable-speed control, 7 = Peekel TF 824 multi-octave filter, 10 = Rohde & Schwarz UBM tunable indicating amplifier, 12 = Tonographie Apparatebau H 83b impulse generator, 13 = R. Verschoor: panel with four Honor TE 22 tone generators, 14 = Peekel 230R noise generator, 15 = R. Verschoor: product modulator.
