1.  An article (so-called ‘ultrasonic transmitter’) consisting of a piezo- electric element in the form of a ceramic disc to which a metal membrane with a radially orientated cone is attached. The whole is fixed to a base plate and is fitted into a plastic casing with connecting pins.   Alternating current causes the piezo-electric element to oscillate, creating ultrasonic waves (inaudible to the human ear) that are transmitted through the air. The article thus converts electrical signals into ultrasonic waves.    The article is used for a variety of purposes including distance measurement in parking aids, space monitoring in car burglar alarms, and liquid level measurement in certain products.   ,8548 90 90,  Classification is determined by General Rules 1 and 6 for the interpretation of the Combined Nomenclature and by the wording of CN codes 8548, 8548 90 and 8548 90 90.    As the article cannot be considered to be a part of a specific machine of Section XVI, classification by virtue of Note 2 to Section XVI is excluded.    As the article cannot be considered to be a part of a specific instrument or apparatus of Chapter 90, classification by virtue of Note 2 to Chapter 90 is also excluded.    The article is an electrical part of machinery or apparatus, not specified or included elsewhere in Chapter 85.    The article is therefore to be classified under CN code 8548 90 90.  ,
  2.  An article (so-called ‘ultrasonic receiver’) consisting of a piezo-electric element in the form of a ceramic disc to which a metal membrane with a radially orientated cone is attached. The whole is fixed to a base plate and is fitted into a plastic casing with connecting pins.   Ultrasonic waves (inaudible to the human ear) cause the piezo-electric element to oscillate and to convert the waves into electrical signals.    The article is used for a variety of purposes including distance measurement in parking aids, space monitoring in car burglar alarms, and liquid level measurement in certain products.   ,8548 90 90,  Classification is determined by General Rules 1 and 6 for the interpretation of the Combined Nomenclature and by the wording of CN codes 8548, 8548 90 and 8548 90 90.    As the article cannot be considered to be a part of a specific machine of Section XVI, classification by virtue of Note 2 to Section XVI is excluded.    As the article cannot be considered to be a part of a specific instrument or apparatus of Chapter 90, classification by virtue of Note 2 to Chapter 90 is also excluded.    The article is an electrical part of machinery or apparatus, not specified or included elsewhere in Chapter 85.    The article is therefore to be classified under CN code 8548 90 90.  ,