Лампа накаливания первых поколений с двумя углеродными нитями накаливания производства "Economical E
"Нано" технологии тех лет: 1901-1908 dual-filament bulb manufactured by the "Economical Electric Lamp Co." of New York. 16 candlepower when the "high" filament is lighted, 1 candlepower when the low filament is lighted. The paper label says: ECONOMICAL 16x1 Pat. 6.1.02 110 Pat. 6.30.03 Stamped on the side of the base: PAT. JULY 9.1901 PAT. NOV. 8.1904 The most pertinent patent is No. 732,644 of June 30, 1903, filed December 30, 1902 Location: Bloomington, Indiana, USA.