By dating item number patent

What Patent Numbers Mean The first Patent Act was signed into effect by George Washington on April 10, 1790.

These dates are a handy reference that you may find useful for figuring out when an item was first produced.This tends to protect the use of these marks, and in general restricts them to use on pieces made in the UK.This protects both collectors and the companies who registered the marks.For these reasons the manufacture of this pipe may be situated in the 1920-1926 period of time.A more accurate dating would be risky as to the lack of a year suffix.

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