| http://www.w3.org/ns/prov#value | - The rigid sheet, which may for example consist of cardboard, may be provided with a hinged lip which, when its free end is upwardly directed, directly indicates the depth at which the package must be placed in the furrow by means of the top edge of the lip, or a marking line provided on the lip, which must be levelled with the surface of the soil.
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