This folder contains correspondence relating to the commercial development of Edison's primary battery in the United States and Great Britain. Among the correspondents are Edison's sales managers for primary batteries, G. E. Hales of the Edison Manufacturing Co., Ltd. , and Elisha E. Hudson of Thomas A. Edison, Inc. There is also a letter by Frank L. Dyer, president of Thomas A. Edison, Inc., concerning the use of primary batteries with railway signals.

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