Tunnels & Tunnelling

Tunnels & Tunnelling

4.11 - 1251 ratings - Source

The solid state conversions were done by Balco (of Blairsville, Pennsylvania), using a Balco-Sevcon design controller. ... in the 3a#39;/2-ton range, always keeping several on hand as backups for when the controllers routinely needed repair.

Title:Tunnels & Tunnelling
Publisher: - 1981


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