Abstract: A mask assembly device includes a front mask mount and a rear mask mount, where each of the front mask mount and the rear mask mount includes a mask mount stand, and a bridge mount including a bridge mount stand. The bridge mount stand includes a bridge mount stand top positioned between the front mask mount and the rear mask mount, and a bridge mount stand magnet which provides a magnetic flux to the bridge mount stand top.

Abstract: A particle removal apparatus includes a main body portion through which a laser for machining a workpiece passes and a particle generated from machining the workpiece is suctioned, and a particle collector connected to the main body portion. The main body portion includes a particle inlet through which the particle removal apparatus is configured to suction, a laser inlet through which the laser passes, a particle outlet through which the particle removal apparatus is configured to discharge the particle suctioned into the main body portion, a first flow path connecting the particle inlet and the laser inlet, and a second flow path connecting the first flow path and the particle outlet. The particle collector is connected to the particle outlet and is configured to apply a first suction pressure and a second suction pressure. The first flow path includes a pressure reducing section.

Abstract: The present invention provides a process for preparing vancomycin hydrochloride using a mutant strain of Amycolatopsis orientalis (accession No. KCCM-10836P) comprising the steps of i) mutating and isolating a strain of Amycolatopsis orientalis (accession No. KCCM-10836P) for producing vancomycin from mother strain of Amycolatopsis orientalis (accession No. ATCC-19795) using NTG(N-methyl-N?-nitro-N-nitrosoguanidine) in the selection medium; ii) seed culturing the isolated mutant strain of Amycolatopsis orientalis (accession No. KCCM-10836P); iii) cultivating and fermenting said mutant strain of Amycolatopsis orientalis in the fermentation medium consisting of 12˜18 (w/v) % of dextrin, 2.2˜3.8 (w/v) % of bean powder, 1.9˜2.9 (w/v) % of potato protein, 0.10˜0.