Patents

Search tools Text Classification Chemistry Measure Numbers Full documents Title Abstract Claims All Any Exact Not Add AND condition These CPCs and their children These exact CPCs Add AND condition
Exact Exact Batch Similar Substructure Substructure (SMARTS) Full documents Claims only Add AND condition
Add AND condition
Application Numbers Publication Numbers Either Add AND condition

Classifications

E21D13/00 Large underground chambers; Methods or apparatus for making them

Landscapes

Show more

CS171193B2

Czechoslovakia

Inventor
T Hallenius
I Sagefors

Worldwide applications
1974 US FR NO CA GB IL JP AT DE FI CH BR CS AR DD ES EG PL YU SU 1977 HK

Application CS5255A events
1974-07-23
Application filed