COMPARISON OF BELL AND SPIGOT STANDARDS. Hatched Sections-American Gas Light Association Standards.

Plain Sections-United Gas Improvement Company Standards.

COMPARISON OF BELL AND SPIGOT STANDARDS. Hatched Sections-American Gas Light Association Standards.

Plain Sections-United Gas Improvement Company Standards.

COMPARISON OF BELL AND SPIGOT STANDARDS. Hatched Sections-American Gas Light Association Standards.