| CPC B60R 1/078 (2013.01) | 7 Claims |

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1. A towing mirror assembly adapted to be mounted to an exterior rear-view mirror, the exterior rear-view mirror having a main mirror frame and a main mirror that is mounted in the main mirror frame, the main mirror frame having a frame rim portion, said towing mirror assembly comprising:
a positioning seat adapted for mounting over the exterior rear-view mirror, and having an external housing wall, an external housing rim that extends transversely from said external housing wall and that is adapted to surround the frame rim portion, a hook set that extends from one side of said external housing rim and that is adapted to engage removably the frame rim portion of the main mirror frame, and a receiving groove unit that is formed on another side of said external housing rim opposite to said hook set, said receiving groove unit having an engaging groove, and a connecting subunit that is adjacent to said engaging groove;
an auxiliary mirror piece mounted on said positioning seat and adapted to be disposed at a lateral side of the main mirror; and
an engaging unit detachably mounted to said receiving groove unit, and having an insertion member that engages removably said engaging groove, a cover plate that is connected to said insertion member and that is adapted to engage removably the frame rim portion of the main mirror frame, and an engaging subunit that is connected to at least one of said insertion member and said cover plate, said engaging subunit being matchingly engaged with said connecting subunit.
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