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John Lienhard, technology historian, says " Most of Gutenberg's early life is a mystery.
His father worked with the ecclesiastic mint.
Gutenberg grew up knowing the trade of goldsmithing.
" This is supported by historian Heinrich Wallau, who adds, " In the 14th and 15th centuries his claimed a hereditary position as ... the master of the archiepiscopal mint.
In this capacity they doubtless acquired considerable knowledge and technical skill in metal working.
They supplied the mint with the metal to be coined, changed the various species of coins, and had a seat at the assizes in forgery cases.

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