Inconvéniant of thelid funnel is to be used as receptacle with abrasive dust which is introduced into the body at the time of the filling.
|The opening or the closing of the holes of filling is carried out by alignment or misalignment of the holes of the lid with those of the body of the huilor. Many techniques are used to facilitate the positioning of these two positions|
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see document of time on the patent HOCHGESAND