. "0"^^ . "doubler"^^ . "an electronic device that doubles the voltage or the frequency of an input signal"@en-us . . . "an electronic device that doubles the voltage or the frequency of an input signal"@en-us . "0"^^ . . . "103110492"@en-us . . . "doubler"@en-us . . "103227721"^^ . "03227721-n"^^ .