| 发明名称 |
Method and apparatus for construction |
| 摘要 |
Long lengths of material are employed for the spiral generation of structures employing two generally concentric conveyors. A strip is fed from the inner conveyor to a spiral generation head while a second strip from a strip forming apparatus is fed to the outer conveyor.
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| 申请公布号 |
US3923573(A) |
申请公布日期 |
1975.12.02 |
| 申请号 |
US19720302836 |
申请日期 |
1972.11.01 |
| 申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
HAY, II, ROBERT A. |
| 分类号 |
B29C44/00;E04B1/32;E04B1/74;(IPC1-7):B31C13/00;B29C23/00 |
主分类号 |
B29C44/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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