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A Birney or Birney Safety Car is a small light streetcar intended to be an economical means of providing frequent service at a lower infrastructure and labor cost than conventional streetcars. The Birney car was the joint 1915 invention of Charles O. Birney, and Joseph M. Bosenbury (who was issued the patents in 1917 & 1919, and assigned half to Birney; see Brill page 140). Birney was an engineer with the firm of Stone & Webster, an operator of a number of trolley systems in the United States of America in the early part of the 20th century.
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Montana, USA
