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Equal-arm chondrometer with grain hopper and weights
1894-1900
1894-1900
1804-1822
1826-1870
1790-1797
1835-1842
1831-1870
1826-1844
1836-1870
1845-1871
1831-1850
1840-1856
1826-1830
1808-1828
1816-1839
1826-1838
1811-1840
1812-1817
1756-1789
1845-1870
1826-1838
1836-1870
1913
1800-1819
1860-1863
1870-1873
1845-1870