Lists all ckts that contain a specific equipment code: select circuit_no.circuit_no from circuit_no,circuits,segments,elements,tid_info,eqptcodes where segments.segments_idx=elements.segments_idx and segments.circuits_idx=circuits.circuits_idx and circuits.circuits_idx=circuit_no.circuits_idx and elements.tid_info_idx=tid_info.tid_info_idx and tid_info.eqptcodes_idx=eqptcodes.eqptcodes_idx and cust_eqptcode={"insert customer equipment code"}