| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 6,397,037 (Franklin et al) describes methods and apparati for transmitting audio signals one way and control signals of various types, two ways, over an RF channel (or channels) in such a manner as to reduce the chance of interfering with or being interfered by, other RF transmissions, and for enabling the use of a multiplicity of such systems in close proximity without having to pre
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