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Can all of the samples for testing of an accordion shutter have center-locking mates?

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Can all of the samples for testing of an accordion shutter have center-locking mates?

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As shown in Question SH21 above, only two of the three impact and cycle samples require the center-locking mates; the third sample must consist of all blade material (no center-locking mate). Samples used for testing to TAS202 or any comparative analysis testing shall not contain the center-locking mates.

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