product line – n : a range of related products marketed by the same company, typically under a common brand name.
Example: Nokia’s cell phone product line includes a range of models of various sizes, with various levels of functionality, and at various price points. Apple’s iPod product line includes digital music players in a range of sizes, storage capacities and prices, in addition to a selection of add-on products such as covers, carriers, head phones and speakers.

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Adapted from "The CompanyCrafters Entrepreneur's Dictionary"
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