div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 5button div class=ts-image amp-img class=ts-thumb alt=Page 5: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails5jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 6button div class=ts-image amp-img class=ts-thumb alt=Page 6: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails6jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 7button div class=ts-image amp-img class=ts-thumb alt=Page 7: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails7jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 8button div class=ts-image amp-img class=ts-thumb alt=Page 8: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails8jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 9button div class=ts-image amp-img class=ts-thumb alt=Page 9: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails9jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 10button div class=ts-image amp-img class=ts-thumb alt=Page 10: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails10jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 11button div class=ts-image amp-img class=ts-thumb alt=Page 11: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through src=https:reader033vdocumentinreader033viewer20220415045e241e769d0b7260e109d201html5thumbnails11jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 12button div class=ts-image amp-img class=ts-thumb alt=Page 12: mediadistributordatasolutionscom · carbon filament lamp was limited to the low value of 14 lumens per watt I-PW The efficacy of incandescent lamps was gradually improved through 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