Invented for use in short wavelength radar during WWII, the cavity magnetron, which was able to produce electromagnetic waves at a lower frequency than had previously been possible, was the basis for the development of the common microwave oven.
A. Invented for use in short wavelength radar during WWII, the cavity magnetron, which was able to produce electromagnetic waves at a lower frequency than had previously been possible,
B. Invented for use in short wavelength radar during WWII, having the ability to produce electromagnetic waves at a lower frequency than had previously been possible, the cavity magnetron
C. A technology invented for use in short wavelength radar during WWII, called the cavity magnetron, which was able to produce electromagnetic waves at a lower frequency than had previously been possible,
D. A technology invented for use in short wavelength radar during WWII, called the cavity magnetron, which had the ability to produce electromagnetic waves at a lower frequency than had previously been possible,
E. A technology invented for use in short wavelength radar during WWII and had the ability to produce electromagnetic waves at a lower frequency than had previously been possible, called the cavity magnetron,