| 45130 | Calculating machines, electronic, capable of operation without an external source of power, whether or not capable of printing (excl. automatic data processing machines) | |
| 45130 | Calculating machines, manually- or electrically-operated, printing or non-printing (excl. automatic data processing machines) | |
| 45130 | Calculating machines, non-electronic | |
| 71630 | Calculation of insurance premiums | |
| 71630 | Calculation of insurance risks | |
| 45280 | Calculators, data processing (having no manual input arrangements), receiving data solely in coded form, off-line | |
| 48232 | Calculators, disc or cylindrical | |
| 45130 | Calculators, electronic, pocket-sized, capable of operation without an external source of power, whether or not programmable (excl. automatic data processing machines) | |
| 32560 | Calendar blocks, printed | |
| 32530 | Calendars giving information concerning public or private events, as publicity | |
| 32560 | Calendars, "perpetual" | |
| 32560 | Calendars, advertising, printed on paper or paperboard | |
| 89200 | Calendered plastic parts manufacturing services | |
| 43933 | Calendering machines (excl. metal- or glass-working) | |
| 44917 | Calendering machines for working glass | |
| 29120 | Calfskins, bovine, whole, dehaired (alum-tanned) | |
| 28310 | Calfskins, with hair on, tanned or dressed, not assembled | |
| 34617 | Caliche (i.e., crude sodium nitrate) | |
| 33690 | Californium and its isotopes | |
| 85939 | Call forwarding services (excluding paging) | |
| 38350 | Call horns, mouth-blown | |
| 84122 | Call management services, fixed, 3-way calling | |
| 84122 | Call management services, fixed, call answer | |
| 84122 | Call management services, fixed, call display | |
| 84122 | Call management services, fixed, call forwarding | |
| 84122 | Call management services, fixed, call return | |
| 84122 | Call management services, fixed, call screening | |
| 84122 | Call management services, fixed, call waiting | |
| 84122 | Call management services, fixed, display bundle | |
| 84122 | Call management services, fixed, messaging bundle | |
| 84122 | Call management services, fixed, voice mail | |
| 84132 | Call management services, mobile device, 3-way calling | |
| 84132 | Call management services, mobile device, call answer | |
| 84132 | Call management services, mobile device, call display | |
| 84132 | Call management services, mobile device, call forwarding | |
| 84132 | Call management services, mobile device, call return | |
| 84132 | Call management services, mobile device, call screening | |
| 84132 | Call management services, mobile device, call waiting | |
| 84132 | Call management services, mobile device, display bundle | |
| 84132 | Call management services, mobile device, messaging bundle | |