1. Thepolyurethane anulum signantesdebet habere bonum signandi effectum in pressione laborante et quadam temperatura extensione, et sponte emendare obsignationem observantiae sicut pressionis auget. 2. Frictio inter anulum polyurethanum obsignatio et partes mobiles parvae esse debent, et frictio coefficiens stabilis sit.
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