The invention relates to a mixing apparatus comprising a mixing bowl and a lid for vacuum-sealing the mixing bowl, which lid is provided with a passage for a mixing rod. The lid is relatively rigid in the axial direction of the mixing bowl, whereas at least the portion of the lid which surrounds the...http://www.google.fr/patents/US5374121?utm_source=gb-gplus-shareBrevet US5374121 - Mixing apparatus with mixing rod supporting lid
