The Dor-O-Matic 1690/1790/1990/2090 Pinion PB5 has been in use since the 1970's. This gear or pinion is what activates the latch or the rods on the 990, 1090, 1690, 1790, 1990 and 2090 devices. The Dor-o-Matic Panic Devices have been around since the late 1960’s, but have most recently been known as the Falcon Panic Device from a name change they had in about 2008. They are the same device, with the same parts, just a different name plate. The manufacture part number on this is CAM.102, PB5 or PB140.