Patent links of Stanton 680 series etc?

https://worldwide.espacenet.com/publicationDetails/mosaics?CC=US&NR=3546399A&KC=A&FT=D&ND=3&date=19701208&DB=EPODOC&locale=en_EP
Patent by Stanton


https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=0&ND=3&adjacent=true&locale=en_EP&FT=D&date=19670110&CC=US&NR=3297831A&KC=A
Patent by Stanton


(Patent numbers found on the box of D6800 HP replacement stylus).


and 2 cited patents from 2nd above patent
Patent by Stanton


https://worldwide.espacenet.com/publicationDetails/biblio?DB=EPODOC&II=1&ND=4&adjacent=true&locale=en_EP&FT=D&date=19640825&CC=US&NR=3146319A&KC=A


https://worldwide.espacenet.com/publicationDetails/mosaics?CC=US&NR=2093540A&KC=A&FT=D&ND=4&date=19370921&DB=EPODOC&locale=en_EP
(Patent by Blumlein)


This is one of citing documents (in German)
https://worldwide.espacenet.com/publicationDetails/mosaics?CC=DE&NR=2159573A1&KC=A1&FT=D&ND=4&date=19720615&DB=EPODOC&locale=en_EP