Based on the wireless gas patrol technology. the design concept and scheme of gas inspection and management system for coal mine is introduced. The wireless gas patrol technology combines TDLAS laser gas detection technology. wireless self-organizing network multi-hop technology and accurate positioning technology. https://www.jmannino.com/quick-save-Canon-imageCLASS-MF227dw-Monochrome-Multifunction-Laser-Printer-great-choice/