FIRE PROTECTION SYSTEMS FOR DISCHARGING A FIRE EXTINGUISHING SUBSTANCE ONTO A PREDETERMINED AREA AFTER SENSING THE PRESENCE OF A FIRE AND PARTS THEREFORE-NAMELY, CONTAINERS FOR HOLDING FIRE EXTINGUISHING SUBSTANCE; MANUAL AND PNEUMATIC ACTUATORS FOR CONTAINERS FOR HOLDING FIRE EXTINGUISHING SUBSTANCE; CONTROL HEADS OF THE MECHANICAL, ELECTRICAL AND/OR PNEUMATIC TYPE FOR OPERATING CONTAINERS FOR HOLDING FIRE EXTINGUISHING SUBSTANCE; DETECTORS FOR SENSING CHANGES IN TEMPERATURES; CONTROL UNITS, POWER SUPPLIES AND ANNUCIATORS