第50届年度I.M.S.A.会议
国际市政信号协会11月12日至15日在芝加哥拉萨尔酒店举行了第50届年度会议，注册了400多次。
High points on the opening business program were addresses by L. M. Johnson, Commissioner of Streets & Electricity, Chicago, on "Chicago’s Post-War Program of Public Works”; Frederick B. Philbrick, president and general manager, The Gamewell Company, whose subject was “What to Expect in Fire and Police Alarm Systems.”
