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Nested and cascaded variable bias feedfoward and feedback...

Fluid handling – Liquid level responsive or maintaining systems – Control of both inflow and outflow of tank
Reexamination Certificate

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Noise reducing housing for toilet tank fill valve

Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Reexamination Certificate

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Non tank pressurizing fast fill receiver and system for...

Fluid handling – Liquid level responsive or maintaining systems – With control fluid connection at desired liquid level
Reexamination Certificate

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Non-chattering float controlled pilot operated diaphragm valve

Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent

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Non-invasive gauge glass liquid level sensor apparatus

Fluid handling – Liquid level responsive or maintaining systems – Electrical characteristic sensing
Reexamination Certificate

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Non-removable refill restrictor apparatus

Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Reexamination Certificate

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Normally-open backwater valve

Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Reexamination Certificate

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