Line diagram of Neale's Ball Token Instrument. Scanned from SCR signalling materials. Scan provided by Apurva Bahadur. (Note: Diagram is linked from single-line block instruments article.)
Date: 2011-11-23
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Line diagram of Neale's Ball Token Instrument. Scanned from SCR signalling materials. Scan provided by Apurva Bahadur. (Note: Diagram is linked from single-line block instruments article.)