Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F17
STORING OR DISTRIBUTING GASES OR LIQUIDS
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F17D
PIPE-LINE SYSTEMS; PIPE-LINES
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3/00
Arrangements for supervising or controlling working operations
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F17D3/03
for controlling, signalling, or supervising the conveyance of several different products following one another in the same conduit, e.g. for switching from one receiving tank to another
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F17D3/08
the different products being separated by "go-devils", e.g. spheres
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