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Apparatus for preventing backing up of sewage in a building

Baths – closets – sinks – and spittoons – Ventilation – House plumbing
Patent

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Drainage system in multi-story building

Baths – closets – sinks – and spittoons – Ventilation – House plumbing
Patent

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Normally closed sewage venting system

Baths – closets – sinks – and spittoons – Ventilation – House plumbing
Patent

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Valve assembly

Baths – closets – sinks – and spittoons – Ventilation – House plumbing
Patent

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Ventilation apparatus

Baths – closets – sinks – and spittoons – Ventilation – House plumbing
Reexamination Certificate

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