发明授权
US3654691A Process for constructing prestressed conduit for heated fluids 失效
用于加热加热流体的预制管道的构造过程

Process for constructing prestressed conduit for heated fluids
摘要:
A process for constructing conduits of at least 30 feet in length within a conduit of a similar length wherein both conduits are joined in prestress.
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