Labels:book | bulletin board | earth | encyclical | monitor | poster | sky | vegetarianism OCR: 23 ELECTRICAL WIRING and LAYOUT SYMBOLS RESIDENTIAL OCCUPANCY BUSS DUCTS AND WIREWAYS SIGNALING SYSTEMS PUSHBUTTON TROLLEY DUCT BUZZER BUSWAY (SERVICE FEEDER OR PLUG IN) BELL CABLE THROUGH, COMBINATION BELL BUZZER BP BP LADDER OR CHANNEL CHIME WIREWAY ANNUNC ATOR ELECTRIC DOOR OPENER REMOTE CONTROL STATIONS FOR MAID'S SIGNAL PLUG MOTORS OR OTHER EQUIPMENT INTERCONNECTION BOX PUSHBUTTON STATIONS IN GENERAL BELL -RINGING TRANSP -ORMER FLOAT SWITCH MECHANICAL OUTSIDE TELEPHONE LIMIT SWITCH MECHANICAL INTERCONNECTING RADIO TELEPHONE PNEUMATIC SWITCH MECHANICAL OUTLET TELEVISION OUTLET ELECTRIC EYE BEAM SOURCE ELECTRIC EYE RELAY PANEL BO ARDS SWITCHBOARDS, AND REL ATED EQUIPMENT THERMOSTAT FLUSH- MOUNTED PANEL BOARD AND CABINET CIRCUITING SUR MOUNTED PANEL BOARD AND CABINET WIRI ING CONCEALED I ...