Rolling rule for typewriter spacing
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LicenseRolling rule for typewriter spacing, French patent
Science Museum Group
© The Board of Trustees of the Science Museum
Rolling rule for typewriter spacing, French patent, by Exa-Corona
Details
- Category:
- Mathematics
- Object Number:
- 1990-684
- type:
- rules (drawing) and rolling parallel rules
- credit:
- Auction Team Koln
