R.W.Hart & Sons in PA.
(close relationship w/ M.Walker of Remington,hence the 1A Hart that has an articulated side bolt stop/release)
Rem Custom Shop manuf a dozen of the Int'L 2oz adj shoe trigger groups-R.W.Hart manuf hundreds of the Int'l trigger groups.
722,721 & 4,5,6 digit Rem did not have the anti bind slot in the port side bolt lug until 7 digit receivers of '72-'73.
Hart Rifle Bbls in Lafayette,N.Y,6mi south of Syracuse,NY.
Hart-
same name,same family.
to OP's question-
Barnard P
Barnard S,s/s & repeaters
Borden RimRock,TPE,Alpine,Timberline
Kelbley,Stolle Teddy,Panda,Kodiak
AI AW
Grunig&Elmiger
40X
700
Junk-in no particular order
Surgeon
Phoenix
Defiance
Stiller
Farley
N.Bay Precision
Marsh
Lawton
Fierce