Patent documents from the 1930s and 1940s show the word "chad", often in reference to punched tape used in telegraphy. These patents sometimes include synonyms such as "chaff" and "chips". A patent filing in 1930 included a "receptacle or chad box ... to receive the chips cut from the edge of the tape."[2] A 1938 patent filing included a "chaff or chad chute" to collect the waste fragments.[3] Both patents were assigned to Teletype Corporation.