MS-2. MS-2 is a two zone conventional fire alarm control panel compatible with the new I3 smoke detectors from System Sensor, and provides such advanced features as drift compensation, maintenance alert, and freeze warning.
The Ring of Fire describes the margins of the Pacific Plate, which is ringed by volcanoes and experiences frequent catastrophic earthquakes, from New Zealand to Indonesia to Japan and Russia's Kamchatka, through Alaska's southern fringe along the entire western coast of the Americas.
Type 4 plates are rated to stop armor-piercing rounds. One round is shot at the plate for this test, and if it compromises the plate then it fails. There are many different ways to create armor plates of both types, with differing effects. That's where it gets complicated.