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A test to measure a unusual parameter must be defined
sufficiently to produce an acceptably accurate result.
Specifying, after the filing date, the device to be used in a
test to measure an unusual parameter, and thus excluding the use
of other devices, is not seen as a disclaimer in the accepted
sense of the word but in this case as an extension of the
subject-matter of the originally filed application.
If the value of an unusual parameter essential to the claimed
invention cannot be sufficiently accurately measured then the
scope of the claim is indefinite.
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