Shares of Telephonics Corp.'s Manhattan parent company, Griffon Corp., climbed more than 7 percent to $17.18 in afternoon trading Friday as the Long Island defense contractor helped propel a slight third quarter revenue increase that was blunted by the impact of foreign currency exchange. Photo Credit: Steve Pfost Shares of Telephonics Corp.'s Manhattan parent company, Griffon Corp., climbed more than 7 percent to $17.18 in afternoon trading Friday as the Long Island defense contractor helped propel a slight third quarter revenue increase that was blunted by the impact of foreign currency exchange.