... receipt requested addressed to the party to whom intend-ed at the following address:a. If to Contractor:(Contractor name and mailing address)b. If to Subcontractor: 19. The validity, instruction ... instructed to do so in writ-ing by Contractor. At the time Contractor notifies Subcontractor to un -dertake such activities, Contractor will notify Subcontractor in writing the total amount ... endure to the benefit of the parties hereto and their respective heirs, executors, administrators,per sonal representatives, successors and assigns. THE PARTIES HERETO ACKNOWLEDGE THAT THEY HAVEREAD...