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Description: | Booklet, British Railways Board, "The Aster System of Track Circuits Without Insulated Block Joints. Volume 1 - Principles (Second Edition)". March 1967. Typed papers stapled with yellow card front and back. | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | booklet | Temporal: | 1967 | Source: | Science Museum | Creator: | British Railways Board | Identifier: | 2002-7036 | Go to resource |
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