Battery powered flashlights and portable electric lights helped end the era of oil lanterns.
(Battery powered flashlights and portable electric lights; helped end; the era of oil lanterns) Context(Battery powered flashlights and portable electric lights helped end,List([0, 67))):(Battery powered flashlights and portable electric lights; helped end helped; end the era of oil lanterns)
Battery powered flashlights and portable electric lights helped end,List([0, 67))
Battery powered flashlights and portable electric lights Battery powered flashlights and portable electric lights
helped end helped end helped
the era of oil lanterns
end the era of oil lanterns