This instrument is marked "Hygrograph SOFNJ No. 2133 Julien P. Friez & Sons Baltimore Md. U.S.A." The firm began trading under this name in 1914; it became the Friez Instrument Division of Bendix in 1930.
Ref: Julien P. Friez & Sons, Hygrograph, or Self Registering Hygrometer (Baltimore, 1908).
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