This Agreement shall come into force and take effect on July 1st, 2018 and shall remain in force until June 30th, 2022. In order to amend this Agreement, written notice, by registered mail, must be given by one party no later than 30 days prior to the end of the present Agreement. Agreement or amendment on which negotiations are begun prior to July 1st, 2022, shall be effective from July 15th, 2022, unless otherwise specified.