73038214
Nov 27, 1974
Oct 26, 1976
SIGNALLING FLARES WHICH PRODUCE LIGHT OR SMOKE AT GROUND OR WATER LEVEL OR IN THE AIR SO AS TO MARK A GIVEN AREA OR LOCATION, WHICH COULD BE USED AS SAFETY DEVICES, FOR EXAMPLE, TO MARK OUT AN AREA TO WHICH ACCESS IS TO BE DENIED TO PEOPLE OR VEHICLES OR OTHER APPARATUS
Electrical and Scientific Apparatus