Rulers, aluminium

Rulers made of aluminium, cm and inch scale, in case

1820 - 0000: scale: 20 cm + 8 inch
1830 - 0000: scale: 30 cm + 12 inch (fig.)
1840 - 0000: scale: 40 cm + 16 inch
1850 - 0000: scale: 50 cm + 20 inch

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