… or whoever, for the purpose of obtaining or aiding to obtain the payment or approval of such claim, or for the purpose and with the intent of cheating and swindling or defrauding the Government of the United States, or any department thereof, or any corporation in which the United States of America is a stockholder, shall knowingly and willfully falsify or conceal or cover up by any trick, scheme, or device a material fact, or make or cause to be made any false or fraudulent statements or representations, or make or use or cause to be made or used any false bill, receipt, voucher, roll, account, claim, certificate, affidavit, or deposition, knowing the same to contain any fraudulent or fictitious statement or entry …