sentences:  "E9" was not fitted with a deck gun during construction, and it is not known whether one was fitted later, as was the case with many boats up to "E19".She was the first of her class to be constructed with five 18 inch (450 mm) torpedo tubes, two in the bow, one either side amidships, and one in the stern; a total of 10 torpedoes were carried.E-Class submarines had wireless systems with power ratings; in some submarines, these were later upgraded to systems by removing a midship torpedo tube.