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248 employment of peaceful means they shall aim to bring about a balance between the various factors of production, and to harmonize the rights of capital and labor. In the case of public services, the workmen shall be obliged to give notice ten days in advance to the Board of Conciliation and Arbitration of the date set for the suspension of work. Strikes shall only be considered unlawful when the majority of the strikers shall resort to acts of violence against persons or property, or in case of war when the strikers belong to establishments and services dependent on the government. Employees of military manufacturing establishments of the Federal Government shall not be included in the provisions of this clause, inasmuch as they are a dependency of the national army.

XIX. Lockouts shall only be lawful when the excess of production shall render it necessary to shut down in order to maintain prices reasonably above the cost of production, subject to the approval of the Board of Conciliation and Arbitration.

XX. Differences or disputes between capital and labor shall be submitted for settlement to a board of conciliation and arbitration to consist of an equal number of representatives of the workmen and of the employers and of one representative of the Government.

XXI. If the employer shall refuse to submit his differences to arbitration or to accept the award rendered by the Board, the labor contract