Valantine & Carr
fl. 1870 - 1930
Valentine & Carr were late 19th century instrument makers working in Sheffield, England. Their work included tuning forks, and they are mentioned as having created tuning forks for the Philharmonic Society of Great Britain in 1896.
See: reference to Valantine & Carr in an article by Alexander J. Ellis "The History of Musical Pitch" in the "Journal of the Society of Arts," March 5, 1880, pg. 300.
See also: George Ashdown Audsley, The Art of Organ Building, . Mineola, NY: Dover Publishing Inc., 1965 [1905], pp.636-637. Accessed via Google Books, http://books.google.com/books?id=I0h525OVoTgC&pg=PA636&lpg=PA636 (accessed 07/29/2015)