The E1 handset was originally manufactured with a transmitter assembly that was mounted inside a hollow enclosure known colloquially as a "spit cup", which would focus sound more effectively to the transmitter.
The E1 handset was originally manufactured with a transmitter assembly ". This transmitter assembly was mounted inside a hollow enclosure. This hollow enclosure was known colloquially as a" spit cup. A "spit cup" would focus sound more effectively to the transmitter.