Operators Piano Company
Early Style A-Roll Mechanisms

Operators very early style A roll spoolbox.

(From December 6, 1913 issue of Music Trade Review)

This very early spoolbox has cast iron side frames. The input shaft with the small pulley is mounted at the very bottom of the transmission.
Operators early style A roll spoolbox.

(Photograph courtesy of Dana Johnson)

This common early A roll spoolbox has cast iron side frames, with the input shaft located left of the tracker bar.
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