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The mixed past and present tenses may seem strange. Here is my reasoning. The panel office, including the sender logic, is a physical design. None are left in use (and almost none in existence) so I've used the past tense. PCI, on the other hand, is a transmission standard, or specification. Even though it may not be in use anymore, I've used the present tense. 71.35.168.146 (talk) 06:57, 11 August 2008 (UTC)