Assertion: cd | /r/HasProperty | created
Facets:
Source sentences:
text: Though initially CDs were created for storing and playing back sound recording, over the years there have been many different types of CDs produced for different types of work, including CD-Text, CD + Graphics, CD-ROM, Video CD, Super Video CD, Photo CD, etc.
text: In the 1970s, when CDs were first developed, considerable error correction was necessary to ensure that the disc would play correctly.
text: When the Compact Disc was developed, the available infra red lasers had a wavelength of 780 nm (nanometer).