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Apparatus for control of liquids

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Apparatus for deploying a work object

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Apparatus for draining land areas with an adjustable system...

Hydraulic and earth engineering – Drainage or irrigation
Reexamination Certificate

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Apparatus for inserting prefabricated vertical drains into the e

Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.
Patent

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Apparatus for placement of lateral drain lines onto a main drain

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Apparatus for preventing contamination of a fresh water...

Hydraulic and earth engineering – Drainage or irrigation
Reexamination Certificate

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Apparatus for soil irrigation

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Apparatus for treating soil

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Apparatus for watering and draining soil

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Aquifer recharge valve and method

Hydraulic and earth engineering – Drainage or irrigation – Having regulation of flow through channel
Reexamination Certificate

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Aquifer recharge valve and method

Hydraulic and earth engineering – Drainage or irrigation – Having regulation of flow through channel
Reexamination Certificate

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Arch conduit

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Arrangement for damming water and also for draining away the vol

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Arrangement for draining liquid collecting on a ground surface

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Arrangement in a drain system and a method for taking care...

Hydraulic and earth engineering – Drainage or irrigation – Branched flow
Reexamination Certificate

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Assembly and method for joining a drain pipe and a catch basin

Hydraulic and earth engineering – Drainage or irrigation
Reexamination Certificate

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Assembly and method for joining drain pipe to concrete catch...

Hydraulic and earth engineering – Drainage or irrigation
Reexamination Certificate

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Athletic field construction

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Automated air handling system for sports field

Hydraulic and earth engineering – Drainage or irrigation – Control means responsive to sensed condition
Reexamination Certificate

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Auxiliary drainage system for eliminating water problems associa

Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.
Patent

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