An improved container for hydraulically and automatically distributing disinfecting, deodorising antiseptic and detergent liquids to flushing cisterns and the like / [John Hubert Williams].

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An improved container for hydraulically and automatically distributing disinfecting, deodorising antiseptic and detergent liquids to flushing cisterns and the like / [John Hubert Williams]. Public Domain Mark. Source: Wellcome Collection.