Concrete jar step insert
作者： Jr. Rodney J. Schmaltz
DOI:
关键词:
摘要: In accordance with the present invention there is provided an insert for placement in a mold forming concrete jar to form holes interior of receiving steps and method or manhole casing enable worker climb into out said casing, including two hollow tubular anchors, each anchors having first end second end, being equal length, rigid frame connected front side back side, extending from frame, parallel other, closed at open end.
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