| 摘要 |
PROBLEM TO BE SOLVED: To provide an analogue odometer for a trailer attached with a 1000-20 tire wherein the rotational frequency of a wheel is directly displayed as a distance, without calculating a result measured with a weight or resorting to a method for calculating a distance using a complex electric pulse or electronic circuit which are subjected to disorder. SOLUTION: A sleeve fixed to the end part of a shaft of a trailer is directly connected to a distance recorder with a flexible tube, for displaying a travel distance.
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