The blame should be put squarely on the shoulders of tophatter.com. They know the quality of what is being sold and choose to look the other way for the sake of making commission and sales fees on these imitation goods. In my estimation and also the interpretation of the law this is outright FRAUD.
Inverse operations are opposite operations that undo each other. Addition and subtraction are inverse operations. Multiplication and division are inverse operations.
What is the difference between a discectomy, a laminectomy, and a fusion? A discectomy involves the removal of a disc. A laminectomy involves the trimming or removal of the lamina bone. A fusion is an operation where two or more vertebral bones are joined together. A single surgery may include more than one of these three procedures.