a. none
b. a whistle, horn, or other mechanical sound-producing device
c. a power-operated whistle and a bell
d. a power-operated whistle, a horn, and a bell
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a. none
b. a whistle, horn, or other mechanical sound-producing device
c. a power-operated whistle and a bell
d. a power-operated whistle, a horn, and a bell
b. a whistle, horn, or other mechanical sound-producing device.
b. a whistle, horn, or other mechanical sound-producing device.
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