Fire extinguisher in the early 60s and Purple-K being developed by the US Navy in the late 1960s. Manually applied dry agents such as graphite for class D (metal) fires had existed since WWII, but it wasn't until 1949 that Ansul introduced a pressurized extinguisher using an external CO2 cartridge to discharge the agent. Met-L-X (sodium chloride) was the first extinguisher developed in the US, with graphite, copper, and several other types being developed later. In the 1970s, Halon 1211 came over to the United States from Europe where it had been used since the late 40s or early 50s. Halon 1301
Cutting extinguisher the fire room and apply conventional fire fighting tactics if required. As very little water is used in the process there is also much less water damage to take care of compared with conventional fire fighting methods. As tactics has developed over the 10 years the technology has been applied it has been found that especially the combination with an Thermal Imaging Camera is useful. The camera is used for finding hotspots or for reading a building etc. and the cutting extinguisher is used for attacking those spots while the result is monitored with the camera. The cutting extinguisher has