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Coupon (PWB) A coupon or test coupon is a printed circuit board (PCB) used to test the quality of a printed wiring board (PWB) fabrication process. Test coupons are fabricated on the same panel as the PWBs, typically at the edges. Coupons are then inspected to ensure proper layer alignment, electrical connectivity, and cross sectioned to ...
But they were a fascinating group of people, John and Paul and George and Ringo, just the four of them together, to watch the interplay between them, and add Yoko into the mix.