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What does the "19.01" mean?(i.imgur.com)

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Enclose0314@discuss.tchncs.de
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askelectronics@discuss.tchncs.de
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I’ve seen different numbers in the same font on many circuit boards. What does it typically mean?

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zarquon@sh.itjust.works
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I’ve never really thought about how it’s done on the older generation parts. On the newest it’s etched by laser. We had a generation where it was stick on barcode and that was the worst.

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