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Method and apparatus for the preparation of a continuous manner, of the sidewalls leakproof at the start of one or more strips of paper or other flexible materials, in sheets, in particular for the purpose of the series production of receptacles àparoi flexible lateral
Method and apparatus for the preparation of a continuous manner, of the sidewalls leakproof at the start of one or more strips of paper or other flexible materials, in sheets, in particular for the purpose of the series production of receptacles àparoi flexible lateral
