Safety closures resistant to (and evidencing) tampering comprising a snap cap or screw cap, a rotary safety ring, and a tear tab attached to the neck of the container, said closure requiring that the tear tab be removed before the safety ring can be lowered; the safety ring must be aligned with the cap...http://www.google.fr/patents/US4646926?utm_source=gb-gplus-shareBrevet US4646926 - Tamper resistant & tamper evident closures
