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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.
length ICTOSS
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).