Electric vacuum cleaner

Washing – cleaning – or drying machine – Washing – cleaning – or drying machine – Surface treatment – e.g. – floor – street – etc.

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Patent

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D03156249

REFERENCES:
patent: D189288 (1960-11-01), Smithson
patent: D233645 (1974-11-01), Diehl
patent: D233647 (1974-11-01), Diehl
patent: D234415 (1975-03-01), Lauderfalk
patent: D258821 (1981-04-01), Wareham et al.

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