PNEUMATIC CORE FOR CONCRETE DUCTS OR PIPES OF NONCIRCULAR SECTION
United States Patent 3428288

Inventors:
Luca, Vasile
Runceanu, Gheorghe
Cosmescu, Ctin
Ionescu, Alexandru
Publication Date:
02/18/1969
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Assignee:
Mini, Ind Const Masini
Primary Class:
249/65
International Classes:
B28B7/32; B28B7/28; B28B7/32




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