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Old 12-03-2013, 08:21 PM
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Ron99 Ron99 is offline
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Quote:
Originally Posted by Proteus View Post
How long has ecotech had the pm power heads. I though but can be very wrong. THat patents were limited to 10 years
20 years from the filing date and it looks like it was filed in 2010. Here's a link if you're curious:

https://www.google.com/patents/US819...ed=0CDkQ6AEwAA

Looks like they have a couple earlier patents too.
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