CDMA used during World War II

CDMA is a military technology first used during World War
II by English allies to foil German attempts at jamming
transmissions. The allies decided to transmit over several
frequencies, instead of one, making it difficult for the
Germans to pick up the complete signal. Because Qualcomm
created communications chips for CDMA technology, it was
privy to the classified information. Once the information
became public, Qualcomm claimed patents on the technology
and became the first to commercialize it