US1128615A
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Governor for vacuum cleaning systems.
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US1013014A
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Portable suction apparatus.
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US1057347A
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Apparatus for removing dust.
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US954541A
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Scrubbing device.
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US1086618A
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Scrubbing mechanism.
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US826513A
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Apparatus for removing dust.
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US865387A
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Portable dust-suction apparatus worked by means of an electromotor.
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US907694A
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Means for observing dust-laden currents of air.
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US841984A
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Separator for apparatus for removing dust.
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US847948A
|
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Apparatus for removing dust.
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US807283A
|
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Separator for apparatus for removing dust.
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US847947A
|
|
Apparatus for removing dust.
|
US963049A
|
|
Apparatus for removing dust.
|
US954542A
|
|
Scrubbing-brush.
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