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Barn, that looks like a "house number" to me. IBM and Western Electric use house numbers all the time. In case you don't know, a house number is an internal number, more or less a part number, assigned by the manufacturer, and as such, is usually an internal secret. The IC may be a very common device, such as a 74LS192, but you'll never know that by the number printed on the IC unless you have some company confidential cross reference. Using one of the Internet data sheet look-up sites will be worthless in this case. Sorry.