When was the Marvel hand embroiderer introduced?

I found this on ebay:
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This is a fascinating Antique item of sewing memorabilia, marked - May, 7 1918 Other Patents pending - It is called the Marvel Machine for Hand Embroidery, and has its Instructions and a Packet of 5 assorted size needles with it, and everything fits in the original box with an Eagle on the top with outstretched wings, and "Marvel". The maker is Marvel NeedleKraft Works, 309-311 Fifth Ave., New York. N.Y. "