Step-by-Step
Community Dial Office

A small step-by-step telephone exchange, here equipped for 200 subscriber lines, is on working display at the museum.

click on images for better views


Don Ostrand demonstrates the step CDO.

Detail of some Strowger Line Finder 
switches in the step CDO.

View left of the step-by-step CDO
telephone exchange.

View right of the step-by-step CDO 
telephone exchange.

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