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Sec. 136. Map of gas mains.

He shall make and keep in his office as the property of the
city a map showing the location, course and dimension of each
gas main in the city, and shall note thereon every change and
extension thereof. The superintendent of the gas works shall
furnish all information necessary to enable him to make such
map, and shall promptly report to him, in writing, any such
change or extension, and a copy of such map shall be furnished
by the Engineer to said superintendent.