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A Sound Pressure-level Meter Without Amplification (1937)
NASA Technical Reports Server (NTRS) · leaf 9
ioj 5 6 I 10* 2 3 4 5 6 8 10" Frequency, cycles per second 0*3 Figure 6.- Over-all frequency characteristics of pressure-level meter.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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