Sylvester Roper is reported to have been issued a patent on April 10, 1866 for his screw in choke device. I've not been able to find a copy of the patent to confirm however. Most of the links on this site do not work unfortunately
http://www.roperld.com/RoperSylvester.htm

Last edited by revdocdrew; 09/07/08 03:16 PM.