Portable observatory

Details Portable observatory Portable observatory

1982-09-30

1984-10-09

Word, A. Hugo

Building units and construction elements

Structure

D25 13, D25 19, D25 56

Patent

active

D02758881

REFERENCES:
patent: 2996844 (1961-08-01), Paulson
patent: 3213571 (1965-10-01), Olson
patent: 3370380 (1968-02-01), Petros
patent: 4388939 (1983-06-01), Barton
patent: 4402544 (1983-09-01), Artim et al.

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