The J.C. Broyles Choke Attachment
April 19, 1902 Sporting Life
At the last GAH at Live Birds in KC
https://digital.la84.org/digital/collection/p17103coll17/id/40544/rec/12



https://patents.google.com/patent/US685669A/en



How about the Dietrich & Hall Automatic Choke System?
https://patents.google.com/patent/US6789343B1/en

Polychoke Poly-matic
https://patents.google.com/patent/US2864194A/en

Adjustomatic by the Hartford Gun Choke Co.
https://www.freepatentsonline.com/3161979.html
Courtesy of Researcher
https://www.shotgunworld.com/bbs/viewtopic.php?t=482452

Choke-matic
Field & Stream 1973
https://books.google.com/books?id=hLBzPXCABmIC&pg=PA146&lpg
From "Guns Illustrated," 1979
Triple-S Development makes this choke in two models for 12 or 16 gauge. The first range goes from Cyl. to Imp. Cyl., the other from Mod. to Full. It is set for the more open pattern for the first shot, and when the gun is fired, the choke automatically advances to the next, or tighter position for the second, longer shot. Or, it can be locked into either position. Price is $34.95 with standard adaptor. "Screw-On" adaptor to fit Winchoke, Lyman Choke, Cutts or Poly-Choke is $4.95.

Jarvis Flex Choke courtesy of Researcher
https://www.shotgunworld.com/bbs/viewtopic.php?f=59&t=294453&start=0

https://sites.google.com/a/damascusknowledge.com/www/home