Armstrong, Westerman, Hattori, McLeland & Naughton
Trusses and precast concrete slabs reinforced thereby
 A space truss is constructed of a pair of plane trusses. Each of the plane trusses is constructed of an upper and lower chord member fixedly connected with each other through a strut member interposed therebetween. The thus constructed plane trusses are oppositely disposed from each other in a condition in which the strut member of each of the plane trusses are interposed between the thus oppositely disposed plane trusses, the upper chord members of the plane trusses are closely disposed together, and the lower chord members of the plane trusses are spaced apart from each other. A sheet steel is fixedly connected to the space truss through a hanging hook to form a composite-type space truss. Any of these space trusses are embedded in concrete in the factory to form a precast reinforced concrerte slab. 
Kajima Corporation Hory Corporation Co., Ltd.
E E E
E04B E04B E04C
inventional inventional inventional
Itaru Kansuke Riyouichi Makoto Toshiyuki
Saito Homma Nakajima Saito Yoshimatsu