US1781699A
|
|
Reenforced concrete pipe
|
US1774664A
|
|
Joint for conduits
|
US1752392A
|
|
Pen
|
US1585785A
|
|
Molding apparatus for concrete articles
|
US1601411A
|
|
Concrete block construction
|
US1507420A
|
|
Expansible-joint construction
|
US1435175A
|
|
Expansible-joint construction
|
US1435174A
|
|
Concrete block construction
|
US1293898A
|
|
Concrete block construction.
|
US1258805A
|
|
Concrete-block construction.
|
US1133313A
|
|
Concrete pipe.
|
US1131646A
|
|
Concrete and steel construction.
|
US764303A
|
|
Concrete-arch construction.
|
US740039A
|
|
Concrete-arch construction.
|
US712841A
|
|
Process of building concrete and masonry structures.
|
US764302A
|
|
Concrete-arch construction.
|
US709794A
|
|
Concrete arch construction.
|
US696838A
|
|
Concrete-arch construction.
|