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Columbian® Poly-Klear® Insurance Form Window Envelopes Window allows for accurate document delivery. Because diagonal seams work better with insertion and extraction equipment they are ideal for invoice processing. Wove exterior looks sharp and adds a professional touch. Envelope Size: 4 1/8 x 9 1/2; Envelope/Mailer Type: Window; Closure: Gummed; Trade Size: #10 1/2.
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