Characters or graphics  to be displayed  (1) Device that can display characters or  graphics other than dots by using a  filter  (2) Device that can display graphics  other than dots by using a vibrating  device  (3) Device that can only display dots  (4) Any other device  6.  Bathwat er  Circulato rs  Inlet  (1) Circulator having an inlet in the  bathtub  (2) Circulator having no inlet in the  bathtub  Structure of the inlet  and outlet  (1) Circulator of which inlet and outlet  are combined  (2) Any other circulator  Maximum suction  capacity per inlet  (1) Less than 25 liters per minute  (2) 25 liters or more per minute but less  than 50 liters per minute  (3) 50 liters or more per minute but less  than 75 liters per minute  (4) 75 liters or more per minute but less  than 100 liters per minute  (5) 100 liters or more per minute  Cover removing method  (1) Cover cannot be removed  (2) Cover can be removed only by using  a tool  (3) Cover can be removed without using  a tool  (4) No cover  Shape of the cover (only  if the circulator has a  cover)  (1) Porous cover  (2) Slit cover  (3) Mesh cover  (4) Cover with a slit and mesh combined  (5) Cover installed with a spacer  attached to a plate  (6) Any other cover  Function to stop  operation when the  cover is removed (only  if the circulator has a  cover)  (1) Cover with such function  (2) Cover without such function  7. Oil- fired  Water  Heaters  Type of product  (1) Heater exclusively used for hot- water supply  (2) Heater used for hot-water supply  and for a bathtub water heater  (3) Any other heater  Protection of the heat  exchanger  (1) Heater where ignition is not possible  when there is no water in the heat  exchanger  49 