They are aggregated from the following Standard International Trade Classification (SITC) subgroupings: (1) 764.1 Electrical apparatus for line telephony or line telegraphy (including such apparatus for carrier-current line systems). Telephone sets; teleprinters; telephonic or telegraphic switching apparatus; other apparatus for carrier-current line systems; other telephonic or telegraphic apparatus. (2) 764.3 Transmission apparatus for radio-telephony, radio-telegraphy, radio-broadcasting or television, whether or not incorporating reception apparatus or sound-recording or reproducing apparatus. Transmission apparatus; transmission apparatus incorporating reception apparatus. (3) 762.81 reception apparatus for radio-telephony or radio-telegraphy; and (4) Parts and accessories suitable for use solely or principally with the apparatus of sub-group 764.1. Expressed in US dollars.