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lab recording, 7/8/1991, 26°C, 60 W bulb for heat (SonyWM-D3 with QMC Mini bat detector at 30 kHz, tape: UX-Pro60, tape no. SO2/91:233-240) lab recording, 7/8/1991, 26°C (Aiwa DAT with AKG D202, tape: SonyDT-60, tape no. D04:36.20-37.10, microphone filter below 100 Hz) |