I was surrounded by the stale smut of clubmen, stories to disturb callow youth, ads for transparencies, truedup dice and bustpads, proprietary articles and why wear a truss with testimonial from ruptured gentleman.
There are no more uses of "proprietary" in the book.
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Tylenol is a proprietary drug that can be purchased in generic form as acetaminophen.
My employment contract prohibits by sharing proprietary information with people outside of the firm.