33 CFR 86.01 - Frequencies and range of audibility.

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§ 86.01 Frequencies and range of audibility.
The fundamental frequency of the signal shall lie within the range 70-525 Hz. The range of audibility of the signal from a whistle shall be determined by those frequencies, which may include the fundamental and/or one or more higher frequencies, which lie within the frequency ranges and provide the sound pressure levels specified in § 86.05.

Title 33 published on 2013-07-01

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U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS
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