Originally Posted By: Ian Forrester
J Purdey has a patent #2952 (03/11/1871) "Screw-in rifled choke tube". Anyone know anything about this.
Source, Nigel Brown's "London Gunmakers".
Ian,

I wish it was easy to access on-line, but unfortunately, several searches did not even come close. If any one has a copy of the patent, it would be worth viewing.

Pete