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STOP.-Swung across the track. See Rule 12 (a).

NOTE

The hand, or a Biz moved the same as the lamp, as illustrated in the following diagrams, gives the same indication.

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PROCEED.-Raised and lowered vertically. See Rule 12

(b).

BACK.-Swung vertically in a circle at half arm's length across

the track. See Rules 12 (c) and 14 (h).

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