definiens: means any occurrence beyond the reasonable control of a Party that prevents or substantially interferes with the performance by the Party of any of its obligations hereunder, if such occurs by reason of any act of God, flood, fire, explosion, earthquake, strike, lockout, labor dispute, casualty or accident ; or war, revolution, civil commotion, acts of public enemies, blockage or embargo ; or any injunction, law, order, proclamation, regulation, ord inance, demand or requirement of any government or of any subdivision, authority or representative of any such government ; or breakdown of plant, inability to procure or use materials, labor, equipment, transportation, or energy sufficient to meet manufact uring needs without the necessity of allocation ; or any other cause whatsoever, whether similar or dissimilar to those above enumerated, beyond the reasonable control of such Party, if and only if the Party affected shall have used reasonable efforts to av oid such occurrence and to remedy it promptly if it shall have occurred