| http://www.w3.org/ns/prov#value | - The card-mounting rack for electronic part-mounting cards as claimed in claim 1, wherein said mother board side connectors are provided on the top face and the bottom face of said mother board, and a plurality of units each formed from one of said platforms, one of the driving mechanisms and one of the card guides are provided symmetrically in upward and downward directions on the upper and lower
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