The name Bertha, after Seattle's first female mayor, , was chosen by a panel (that included the Governor and Transportation Secretary) from 150 submissions from kindergarten through 12th graders, who were asked to submit female names with Washington state heritage. The winning entry, which was submitted by two elementary schools in and , was selected in December 2012.
[pdf] There is a wide selection of models including box and trailer type configurations with continuous duty outputs from 1.84 to 34 m3/min (65 to 1,200 cfm) and rated pressures from 7 to 24.5 bar (100 to 355 psi). A factory installed aftercooler option is available for most of the 7 bar compressors.
[pdf] Incorporated in Australia in 1990, Terratec is the world’s leading designer and manufacturer of Tunnel Boring Machines, Raise Boring Machines and other custom-engineered products for the tunnelling and mining industries, encompassing all ground conditions and boring diameters from 0.6m to 15m.
[pdf] 
