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Vacuum Gauge
Eugène Bourdon, c. 1860
Polarising Filter
John Benjamin Dancer, c. 1880
Salinometer
A.P. How, 1850 - 1865
Log Timer
Rasmus Dekker, c. 1795 - c. 1812
Eugène Bourdon, c. 1860
John Benjamin Dancer, c. 1880
A.P. How, 1850 - 1865
Rasmus Dekker, c. 1795 - c. 1812