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Sewing machine patent search

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Wondering if yall have any resources to find patents for old industrial machines.

I am on a quest to find technical drawings for an old industrial singer and have had no luck after days of searching.

It appears that a lot if these old machines don't have shop manuals or maintainence guides. I'm thinking the next best step would be an original patent drawing.

Any advice or leads would be greatly appreciated

Thanks

 

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You can search patents on Google; there is a section devoted to them.

 

That said, there are also a lot of manuals available online if you keep looking.  Which specific machine are you trying to find drawings of?

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I have original Singer manuals dating back to the 30's. Which machine class?

Regards, Eric

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