Electric rock drill digging bees

The most common species of ground bee — Colletes inaequalis— is a black and tan-colored bee with a black abdomen and tan stripes. These ground nesting bees can be identified by their fuzzy tan-colored. [pdf]

Russian excavation and conversion hydraulic rock drill manufacturer

Ural Siberian Industrial Company (USIC) – Russian manufacturer of completed drilling rigs for production and exploration drilling. Additionally, USIC manufactures drilling rigs components and units, as well as modernizes drilling equipment. [pdf]