The U.S. Army Corps of Engineers is organized geographically into eight permanent divisions, one provisional division, one provisional district, and one research command reporting directly to the HQ. Within each division, there are several districts.
Laser Safety Glasses - Holmium Laser. 1  On this page you will find our range of Holmium laser safety glasses , Ruby laser safety glasses, Dye and Erbium Laser Safety Glasses. 2  Important: Australian laser safety standards AS/NZS 2211.3:2002 require L-Ratings to be clearly marked on the laser glasses.
There are two main types of Opera Glasses: Monocular and binocular. There are 4 subgroups of binocular glasses: Lorgnette: binoculars with an extended handle, miniature (up to 3-4cm in height), unusual: such as Jealousy Glasses, that had a sideways mirror to allow discreet observation of other people and regular.