If any operator who is liable for any tax or penalty under this chapter sells or otherwise disposes of his business, his successor shall withhold a sufficient portion of the purchase price to equal the amount of such tax or penalty until the selling operator produces a receipt from the Director of Finance showing that the tax or penalty has been paid or a certificate from the Director of Finance stating that no tax or penalty is due. If the seller does not present a receipt or certificate within 30 days after such successor commences to conduct business, the successor shall deposit the withheld amount with the Director of Finance, pending settlement of the account of the seller. (Ord. 1471 § 1, 1973; Ord. 1339 § 1; prior code § 7.315).