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divider the difference between said estimated cost so advanced and the actual cost. supplies delivered to the job; the cost of all labor employed in connection with the installation of saxd water main; the cost of premium on contractor's surety bond, Public Liability, Property Damage and Contractor's Contractual Liability Insur­ance, plus ten percent (10$) for supervision and overhead. 3 , This agreement shall inure to the benefit of and be binding upon the heirs, executors, administrators, successors and assigns of the respective parties hereto. . this agreement as of the day and year first above written. 1 ^ By actual cost is meant the cost of all material and 0) | IN WITNESS WHEREOF, the parties hereto have executed M LAS VEGAS LAND AND WATER COMPANY Attest: / Wi tne Bili J.pardon f a Partnership Doing business as Ar-Bee Company M ^ • 4 . mm