The first Neutrality Act imposed upon all persons required to register with the National Munitions Control Board an obligation to maintain permanent records of all arms, ammunition and implements of war manufactured for importation and exportation under the rules prescribed by the Board.[506] The requirement was continued in the 1937 Amendment which designated the Secretary of State (Chairman of the N.M.C.B. under the old and the amended Act) as recipient of the information to be submitted.[507] The Foreign Agents Registration Act of 1938 (as amended in April 1942) not only required the filing of registration statements by agents of foreign powers, but compelled each registered agent to keep and preserve books of account and other records which he was required to disclose under regulations prescribed by the Attorney General.[508] As to procurement statutes, Congress, in connection with a 1934 enactment directed against excessive profit-making or collusive bidding in connection with naval construction contracts, required contractors to agree, as a condition of receiving a navy contract, to submit reports which would show conformance or non-conformance with the provisions of the Act.[509] The Second War Powers Act of 1942 followed up the grant of power to exact priorities with a section entitling the President to obtain a wide variety of information from any persons holding defense contracts. Contractors were required to keep accurate records in readiness for whatever accounting the President might eventually request.[510] _Authorization for the Conduct or Study of Experiments_: The Tennessee Valley Authority Act authorized the T.V.A. to establish the physical plants necessary to undertake experiments for the production of nitrogen products for military and agricultural uses. Such experiments were to emphasize both economy and high standards of efficiency.[511] A 1938 statute authorizing the construction of naval vessels included provision for the construction of experimental vessels and the construction of a rigid airship of American design and American construction.[512] Implementing the latter, appropriations were authorized for the purpose of rotary-wing and other aircraft research, development, procurement, experimentation, and operation for service testing.[513]