Building block

Details Building block Building block

1976-05-19

1977-08-09

Word, A. Hugo

Building units and construction elements

Structure

Simulative

D2501

Patent

active

D02453401

REFERENCES:
patent: 1262308 (1918-04-01), Colt
patent: 1338468 (1920-04-01), Tsanoff
patent: 1411005 (1922-03-01), Dula
patent: 1910810 (1933-05-01), Nash
Concrete, Oct. 1959, p. 11, blocks at top left of page.

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