I came across these ads for Follett's Pneumatic Concentrator, but can't find any articles in period sporting journals, a patent, nor reference to E.P. Follett & Co. in Chicago
April 1909
Field & Stream![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Shotshells-and-pressures/Shotshells/i-Bk7dtnW/0/18fefa1b/M/Follett%20Field%20%26%20Stream%204-1909-M.png)
November 1909
Forest & Stream. The cup was apparently a paper case with a metal base?
![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Shotshells-and-pressures/Shotshells/i-PCxPBSL/0/240e3e30/M/Follett%27s%20Forest%20%26%20Stream%2011-1909-M.png)
1911
Hunter - Trader - Trapper![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Shotshells-and-pressures/Shotshells/i-GsLZ8vj/0/794f2a31/M/Follett%20HTT%201911-M.png)
This is a 1969 patent with a similar concept. If you scroll to the bottom the Follett device is not referenced and the earliest patent is 1914
https://patents.google.com/patent/US3724378 A "shot container" from 1989; "the container for containing the shot pellets comprises a container body constituted by a non-slit tube and a disc integral therewith and in contact with the wad"
https://patents.google.com/patent/US5299502
