Edison's light bulb could be on endangered list
History of the First Lightbulb
Edison Bulbs - Light Bulbs - The Home Depot
Edison's first successful electric lamp
File:Edison effect bulb 1.jpg - Wikipedia
Wedge base - Wikipedia
Edison Bulbs - Light Bulbs - The Home Depot
Incandescent light bulb - Wikipedia
Edison's Lightbulb The Franklin Institute
Thomas Edison - Wikipedia
File:LED bulbs.jpg - Wikipedia
LED lamp - Wikipedia
National Museum of American History
Incandescent light bulb - Wikipedia