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Josef Pfeifer
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On-Site Construction Work That Accompanies The Preparation And Application Of Concrete
(AREA)
Abstract
17,595. Pfeifer, J. Aug. 31. Co n c r e t pipes are strengthened by a set of hoop irons embedded at intervals, and other hoop irons between and in contact with them. In the pipe shown, the hoop irons bare circular and the irons c elliptical.
GB190517595D1905-08-311905-08-31Improvements in Concrete-pipes.
ExpiredGB190517595A
(en)