In 1639 he issued a pamphlet at Cologne to mark the bicentenary of the invention of printing by moveable type in Europe, defending the priority of Gutenberg; it was titled  ("Of the rise and progress of the typographic art"), that includes the phrase , "the first infancy of printing".
To mark the 200th anniversary of the invention of movable-type printing in Europe, he wrote a pamphlet at Cologne in 1639 to defend Gutenberg's claim to priority; it was titled  ("The history and progress of typography"), which includes the phrase , "the first infancy of printing".