- Balcom & Vaughan Pipe Organs
- Ballard Pipe Organs
- Buzard Pipe Organ Craftsmen
- Buzard Pipe Organ Craftsmen
- C & M Floors
- C B Fisk Inc
- Eastern Organ Pipes Inc
- Goulding & Wood Pipe Organs
- H A Howell Pipe Organs
- Hagerstown Organ Co
- J Allen Farmer Inc
- L A Carlson Co
- L A Carlson Co
- Michael Proscia Organbuilder
- Nichols & Simpson Inc
- Ott Pipe Organ Co
- Richards Fowkes & Co
- Ross King Co
- Saville Organ Factory Sales
- Skinner Organ Mfg Co
- Steiner-Reck Inc
- Taylor & Boody Organ Builders
- Webber & Borne Organ Builders
- William H Longmore & Assoc
