A double-slide boxwood proof rule by T.O. Blake, 57 Hatton Garden, London --24½in. long; two sectional gauging rods; another dip rod; and five ebony rules (9)

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A double-slide boxwood proof rule by T.O. Blake, 57 Hatton Garden, London --24½in. long; two sectional gauging rods; another dip rod; and five ebony rules (9)

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