From the OHS Database, Builders Listing Editor, added Mar 4, 2016 —

Holmes Organ Co. was a small firm primarily engaged in repair and rebuilding. Owner Keith F. (Pat) Holmes did not advertise particularly and his instruments were often rebuilds. He likely had some other income and did not have to strive in the business; it was not well-known outside of Ontario. The firm was active in London, Ontario, Canada in the 1950s and 1960s.

Staff: Garbriel Kney and John Bright; both left to start Kney and Bright in the 1950's.

Source:

Donald Pole, retired organ-builder and owner of Pole and [Ron] Kingham Pipe Organs of Chatham, Ontario, e-mail to Ian Mason, dated March 4, 2016.