Such uses shall be limited to the erection,
construction, alteration or maintenance, by public utilities or municipal
or other governmental agencies, of electric, gas, water transmission
or distribution systems or collection, communication, water supply
or sewage treatment and collection systems, including poles, wires,
mains, drains, sewer, pipes, conduits, cables, fire alarm boxes, police
call boxes, traffic signals, light stanchions, telephone lines, hydrants
and other similar equipment and accessories in connection therewith
reasonably necessary for the furnishing of adequate services by public
utilities or municipal or other governmental agencies or for the public
health, safety or general welfare, but not including buildings.