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Spectivos aperfeicoados elementos fotograficos aperfeicoamento em processo para preparar uma composicao de revestimento para elementos fotograficos, bem como os r
Un procedimiento para ajustar émbolos, cilindros, cojinetes y otras piezas similares sometidas a esfuerzo de deslizamiento en motores de combustión, bombas y máquinas semejantes
Un nuevo procedimiento para la conservación de los colectores, anillos de arranque y demás piezas correspondientes en toda clase de motores eléctricos.
Un procedimiento para obtener nuevos reveladores y fijadores fotográficos estables para emulsión de haluros de plata en gelatina, que contienen los reductores orgánicos conocidos.