Interlocking building block

Details Interlocking building block Interlocking building block

1975-02-10

1977-05-03

Word, A. Hugo

Building units and construction elements

Structure

Simulative

D2501

Patent

active

D02442019

REFERENCES:
patent: 1565959 (1925-12-01), Requa
patent: 1585374 (1926-05-01), Carlsson
patent: 3780484 (1973-12-01), Muse
patent: 3783566 (1974-01-01), Nielson

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