APF, if it was not for this wording I would agree: "or by other mechanical contrivance", this does not include the normal "handle of the knife" or even "automatic opening" the two phases the AO system was designed to work around as it list them first and then adds this language to cover any special opening system. In the wording of this law , ANY folder being able to be flicked open is also illegal. As a former NYC LEO who spent far too many days out of the sun in court, I must say this guy seems to be in clear violation of the wording of the city ordiance quoted ( no less in a court house).