Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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9/00
Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
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G01N9/10
by observing bodies wholly or partially immersed in fluid materials
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G01N9/12
by observing the depth of immersion of the bodies, e.g. hydrometers
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G01N9/18
Special adaptations for indicating, recording, or control
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