"scuba diving." marcy invented a new type of mask that was not subject to fogging for scuba divers and obtained a patent on it. she agrees to allow jenny to manufacture and sell the mask. she receives a sum of money for every mask that jenny sells. marcy also entered into an agreement with frank to allow him to sell the masks, but only if he also purchased non-patented diving suits from marcy. all parties proceeded to do very well with their sales.