Sylvanus Tenney in Johnsonville, Illinois, 1878-1882, then Elk Falls, Kansas, 1888
Based on the locations and dates, I would guess the Sylvanus was building and/or working on half stock plains rifles. They could have had bar locks or back action locks. He was working through the beginning of the cartridge era, and undoubtedly worked on those types of guns, also.
John Bair in Jefferson, Pennsylvania, 1807-1815
Looks like John was working in western Pennsylvania. Depending on where he got his training, but his customers there were likely wanting the Western Penn/Ohio style of rifle. I suspect that area was pretty settled then, and the rifles would have been of small caliber.
W. R. Bair in Camas Valley, Oregon, 1881
Like Sylvanus, W. R. was probably working on and possibly building some half stock percussion rifles. He probably worked on cartridge guns, too.