A. Every airport, and every plant, field and structure used for the manufacture, assembling or testing of aircraft;

B. Every tank-farm, refinery, compressor plant or absorption plant, marine terminal, pipeline pumping station and reservoir, used for the bulk treatment, bulk handling or bulk storage of petroleum or petroleum products;

C. Every reservoir, dam, pumping station, aqueduct, main canal or pipeline, of a public water system;

D. Every reservoir, dam, generating plant, receiving station, distributing station and transmission line of a company or agency furnishing electrical energy;

E. Every gas generating plant, compressor plant, gasholder, gas tank, and gas main, used for the production, storage and distribution of gas;

F. Every plant or vital part thereof or other principal property essential to rendering telephone or telegraph service;

G. Every radio broadcasting central plant or station;

H. Every railroad bridge or tunnel;

I. Every plant for the bulk storage of dynamite, giant powder, gunpowder or other explosive;

J. Every warehouse where cotton, grain or other agricultural products are stored;

K. Every fire department. (Prior code § 10.45.030)