The Shure SM59 microphone patent, US3989905 link

https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=3989905A&KC=A&FT=D&ND=3&date=19761102&DB=EPODOC&locale=en_EP


See also: Shock Mounting Apparatus:


https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=19720404&CC=US&NR=3653625A&KC=A