Electronic controllers for operation of movable gates; parking arms; utility doors and doors; traffic control barriers; traffic control spike systems incorporating metal spikes in a frame to be placed in the path of vehicles; illuminated metal traffic signs; power backup controllers; programmable access controllers; telephone entry systems consisting of box and associated electronic circuitry; intercom units and related electrical circuitry allowing for communication between telephones at dif...

Electronic controllers for operation of movable gates; illuminated metal traffic signs; power backup controllers; programmable access controllers for providing access to doors, utility doors, gates, facilities, entrances, and exits; telephone entry systems consisting of box and associated electronic circuitry, for use with doors, utility doors, gates, facilities, entrances, and exits; intercom units and related electrical circuitry allowing for communication between telephones at different lo...

sliding and swinging gates, overhead and utility doors, traffic control barriers made primarily of metal, traffic control spike systems incorporating metal spikes in a frame to be placed in the path of vehicles, non-illuminous metal traffic signs

electronic controllers for operation of movable gates and doors, programmable access controllers, telephone entry systems consisting of box and associated electronic circuitry, intercom units and related electrical circuitry allowing for communication between telephones at two different locations, electrical ground control loops for operation of gates and doors, electrically operable key switch lock boxes and card entry readers

ELECTRIC POWER [ OPERATED ] MECHANISMS FOR OPENING AND CLOSING OVERHEAD GARAGE DOORS