Classification opinions
… “ Central greasing systems ” , hand-operated or automatic, for lubricating semiautomatic machines, consisting of a … Adoption : 1959 … 2. Fumigation chamber, mounted on wheels for disinfecting shrubs, seeds, books, manuscripts, etc., by … acid, etc. Adoption : 1961 … 3. Self-propelled machines for sweeping factories, etc, equipped with a driver's seat …