"A noisy closet in the modern home is a sign of indifference to the feelings of guests and family. The Si-wel-clo reduces the noise of flushing to the minimum. It suppresses a noise you do not want heard and do not want to hear..." Quiet Si-Wel-Clo toilet bowl. The Trenton Potteries Company, Trenton, New Jersey, USA. 1922 advertisement. Click
here to enlarge. Five years after this advertisement was published, the U.S. Supreme Court ruled against Trenton Potteries in a Sherman antitrust case which can be found
here.