In the case of Maas & Waldstein Co. v. United States, 1930, the U.S Supreme Court ruled on a dispute regarding customs duties imposed by the government on imported merchandise. The plaintiff, Maas & Waldstein Co., argued that they were overcharged for their importation of artificial flowers from Germany due to an incorrect classification under paragraph 1712 of the Tariff Act of October 3rd, 1913 which resulted in higher duty rates than necessary. However, after reviewing evidence presented by both parties and considering relevant tariff laws and regulations at that time including those related to "imitations" or "substitutes", it was determined by Justice Stone that there had been no error made in classifying these goods as 'artificial flowers' rather than 'vegetable substances'. Therefore, he upheld the decision made by lower courts favoring United States Customs officials who levied these charges initially.

In the dissenting opinion for the case of Maas & Waldstein Co. v. United States, it was argued that the majority's interpretation of Section 28(a) of the Bankruptcy Act was incorrect and overly broad. The dissenting justices believed that this section should not be applied to cases where a creditor has received preferential payments from an insolvent debtor through no fault or action on their part, but rather due to circumstances beyond their control such as in this case where payment was made by a third party bank without knowledge or consent from either party involved in litigation. They contended that applying Section 28(a) in such instances would unjustly penalize innocent creditors who had acted in good faith and could potentially discourage future lending activities out of fear for similar repercussions.