| http://www.w3.org/ns/prov#value | - A still urther object of my invention is to provide a loud speaker having an opening of such size that the lowest music frequencies will notbe reflected thereat but will be effi'ciently radiated. 1 For the reproduction of vocal and other sounds, a sound radiator is desirable which is capable of radiating equally well the sound waves of all the frequencies involved in speech m and music. 7 In a lou
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