euroelectron
Sunday, January 19, 2020
The AKG sintered bronze microphone cap patent (metal balls mesh)
US3652810
https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=19720328&CC=US&NR=3652810A&KC=A
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