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Section: ArticlesTitle: Portable ladders : data sheet 665Notes: Sumario: This data sheet covers the selection, maintenance, and use of portable ladders used in service and manufacturing industries. No scaffolds or power-driven telescoping devices are discussed. This paper includes: selection of ladders: folding stepladders, combination or convertible ladders, straight and extension ladders, sectional ladders, trestle ladders, office and stockroom ladders, tubular metal ladders; hazards encountered when using ladders; using ladders; maintenance of laddersRelated records: En: National safety news. - Chicago. - Vol. 116, nº 1, July 1977 ; p. 79-85Materia / lugar / evento: Seguridad e higiene en el trabajoAccidentes de trabajoPrevención de accidentesEscalerasEscaleras móvilesSecondary titles: Título: National safety news Other categories: 871Rights: In Copyright (InC)