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Ball Point Pens
Everyone knows the story of the humble Biro, or think they do, because it is more complex than generally appreciated.
The principle of the Ball Point pen is that within the writing tip a metal ball housed in a socket rotates freely and rolls quick drying ink onto the writing surface. The writing ball being continuously fed by ink from the reservoir which generally is the pen barrel or a tube within.
This principle of the ball point pen actually dates from the late 19th Century when Patents were taken out by John Loud in 1888 for a product to mark leather and in 1916 by Van Vechten Riesberg, however neither of these Patents were exploited commercially. Should they have been then we wouldn't have heard the cry 'Has anyone seen my Biro' but instead 'Where's my Vechten Riesberg got to?'
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