Cassette (10) lost for lightening reticular slabs of the type comprising a first body (1) essentially parallelepiped and which is characterized in that two parallel guides (2) are solidly joined together on its lower face (1a); wherein said guides have at least three projections (3) in the form of a pivot protruding from the body (1) once the guides (2) have been coupled; and where at least two of said projections (3) comprise, in opposite manner, a broadsword (4) that is housed in its own body (1) by its lower face (1a). (Machine-translation by Google Translate, not legally binding)
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