Folding steel ruler manufactured by Chesterman Sheffield (England). The metal ruler measures 21 inches long when unfolded, and consists of seven pieces each three inches long, which fold together to a compact form 3 cm x 1 cm x 0.5 cm.
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Folding ruler ([approximately 1919]). State Library of South Australia, accessed 22/01/2026, https://digital.collections.slsa.sa.gov.au/nodes/view/6865
