Wall and ceiling construction
作者： Nels Nelsson , Karl Knohl Friedrich
DOI:
关键词: Ceiling (cloud) 、 Structural engineering 、 Materials science
摘要:
lens.org 参考文章(3)
Stern William, Screw having a drill point and serrated cutting edge ,(1957)
Louis J. Lovisek, Self-countersinking screw having head with arcuately curved undersurface ,(1956)
Frank E Newton, Method of locking together metal sheets ,(1931)