http://en.wikipedia.org/wiki/Magnuso...t#Requirements
Was curious so I looked it up.
Quote:
Under the terms of the Act, ambiguous statements in a warranty are construed against the drafter of the warranty.
Likewise, service contracts must fully, clearly, and conspicuously disclose their terms and conditions in simple and readily understood language.
Warrantors cannot require that only branded parts be used with the product in order to retain the warranty.[7] This is commonly referred to as the "tie-in sales" provisions,[8] and is frequently mentioned in the context of third-party computer parts, such as memory and hard drives.
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Quote:
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The federal minimum standards for full warranties are waived if the warrantor can show that the problem associated with a warranted consumer product was caused by damage while in the possession of the consumer, or by unreasonable use, including a failure to provide reasonable and necessary maintenance.
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Note this is just a summary from Wikipedia- I'm not familiar enough with US Law to state whether or not there are other pieces of legislation that interfere with this as it stands.