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Title: Rolling rule for typewriter spacing, French patent, by Exa-C [Go to resource]
Description: Rolling rule for typewriter spacing, French patent, by Exa-Corona License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: rules (drawing)
rolling parallel rulesSource: Science Museum Creator: Exa-Corona Identifier: 1990-684 Go to resource More Like this...
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