A patent claim has three major sections, namely, a preamble, a transitional phrase and a body. The body of the claim contains the elements which define the scope of patent protection as defined by that claim. The transitional phrase indicates whether incorporating other elements or components in an accused infringing device other than those elements recited in the body would avoid infringement of the claim.

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Note added at 1 day 3 hrs (2018-06-16 18:37:18 GMT)
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http://www.ampertrans.com/en/Patente.pdf