13.—(1) An inspector shall obliterate the stamp on any automatic rail-weighbridge which has, since it was last stamped, had any alteration or addition made to it such that it could not be passed as fit for use for trade under regulation 9.
(2) Subject to paragraph (3), an inspector shall obliterate the stamp on any automatic rail-weighbridge which has, since it was last stamped, been the subject of any adjustment, alteration, addition, repair or replacement which could, in the opinion of the inspector, have affected its accuracy or function.
(3) Where an automatic rail-weighbridge has been subjected to one or other of the occurrences in paragraph (2) and the chief inspector of weights and measures for the area in which the weighbridge is situated has been furnished in writing with details of the occurrence, an inspector may obliterate the stamp.