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Micheal Gunderson Mandt
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18,625. Mandt, M. G. Sept. 4. Building - blocks. -Hollow concrete building- blocks for walls consist of a rectangular part 1, and a V-shaped part 2 formed integrally as shown in Fig. 1. When the blocks are laid in courses to form a wall, the V-shaped members of one course overlap and bund with the V-shaped members of the course below so that a series of air passages 3, 5 are formed as shown in Fig. 2.
GB190818625D1908-09-041908-09-04Improvements in Concrete Building Walls.
ExpiredGB190818625A
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