| 摘要 |
PROBLEM TO BE SOLVED: To enable recycling and to facilitate manufacture. SOLUTION: The counterweight 2 includes: a hollow frame 4; an iron-based weighty material W inserted in the bottom part in the hollow frame 4; and concrete 6 injected into a space above the iron-based weighty material W in the hollow frame 4. COPYRIGHT: (C)2011,JPO&INPIT
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