563:Enegry Saving

The parent to the modern ______ was invented in the late 1890s by Peter Cooper Hewitt.The Cooper Hewitt ______ were used for photographic studios and industries.Edmund Germer, Friedrich Meyer, and Hans Spanner then patented a high pressure vapor ______ in 1927.George Inman later teamed with General Electric to create a practical ______, sold in 1938 and patented in 1941.The modern ______ was invented by Edward E. Hammer, an engineer with General Electric, in response to the 1973 oil crisis. While it met its design goals, it would have cost GE about US$25 million to build new factories to produce them and the invention was shelved.The design was eventually leaked out and copied by others.______ have steadily increased in sales volume.

Ans:CFL