[en] The multiturn 70 GeV proton beam extraction towards beam line 2(14) for the PROZA facility with a single crystal of Si bent by 80 mrad installed into the IHEP accelerator vacuum chamber is realized. When (2-3)x10¹⁰ accelerated protons were spilled onto the crystal, about 2x10⁶ particles were recorded in the beam line. Thus, the extracting efficiency is about 0.8x10^-4 by an extracting time of up to 2 s. The possibilities for increasing the extracting efficiency as well as the simultaneity coefficient of the physical facilities are discussed. (orig.)