§ 232. Trade mark. If there is any quality mark printed, stamped or
branded on the article itself there must also be printed, stamped or
branded on the said article itself the following mark, to wit: a trade
mark duly applied for or registered under the laws of the United States
of the manufacturer of such article; except that if such manufacturer
has sold or contracted to sell such article to a jobber, wholesaler or
retail dealer regularly engaged in the business of buying and selling
similar articles, this provision shall be deemed to be complied with if
there is so marked on the said article the trade mark duly registered
under the laws of the United States of such jobber, wholesaler or retail
dealer respectively; and in such event there may also be marked on the
said article itself numerals intended to identify the article, design or
pattern provided, however, that such numerals do not appear or purport
to be a part of the quality mark and provided that they are not
calculated to mislead or deceive anyone into believing that they are
partly of the quality mark.