Why are the threads yellow? What was their purpose?
I is just a guess, but the yellow offers contrast against the black background. Perhaps the yellow helped with the alignment process. I can think of no other reason.
I is just a guess, but the yellow offers contrast against the black background. Perhaps the yellow helped with the alignment process. I can think of no other reason.
Peter Manzie
Just another thought: Perhaps the colored threads helped to identify a batch or lot. Could also be a code to identify the manufacturer.
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