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| 公开/私有: | 公开 私有 |
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C. Marhold,
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- welding (3)
- oxyacetylene welding and cutting (2)
- plastics (2)
- acetylene (1)
- aluminothermy (1)
- condensation products (chemistry) (1)
- electric welding (1)
- metal spraying (1)
- metal-cutting (1)
- vinyl chloride (1)
- vinyl polymers (1)
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