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R. L. Boulter, made telegraph equipment in Los Angeles, California between 1913-1920. A "key" is the 'sending' part of a telegraph, also sometimes called a 'bug'.
According to Neal McEwen, curator of The Telegraph Office, A WWW Page for Telegraph Key Collectors and Historians,
"[The Boulter key] is a high speed sending key. R. L. Boulter of Los Angeles was issued four patents in the pre-WWI period. He made only a few keys that can be found.Later, Horace Martin bought the rights to the four designs in the Boulter patent (#1110373)."It has a maroon base with gold pin stripping, bearing the serial number of 258; hopefully other Boulter bugs remain to be discovered."
David Boulter plays the piano, organ and percussion in the UK-based band, Tindersticks.