Registration application shall be typed in duplicate and filed in accordance with such instructions as the commissioner may publish from time to time. Applications will be deemed to be filed upon receipt in either office of the Department of Savings and Loan. The instructions shall set forth the form of the registration application to be completed and filed by every person and company defined as a savings and loan holding company, hereinafter referred to as “Registrants.” Copies of such instructions will be available at either office of the Department of Savings and Loan.