The overall construction hasn't really changed much
Ever since Edison produced his first practical light bulb way back in 1880, not much has changed with the overall construction. It looks the same, functions the same and, allowing for inflation, costs much the same as it did in 1912. 
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Argumentation and Debate - 62241 »Argumentation and Debate - 62241
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Kara Miller »Kara Miller
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Top 5  »Top 5
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Top 5 Things That Haven't Changed in 100 Years »Top 5 Things That Haven't Changed in 100 Years
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02. The Incandescent Light Bulb »02. The Incandescent Light Bulb
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The overall construction hasn't really changed much
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The function has stayed the same and so has the look »The function has stayed the same and so has the look
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