North American Product Classification System (NAPCS) Canada 2017 Version 2.0
- 345 - Other general-purpose machinery and equipment, n.e.c.
- 34531 - Boilers, metal tanks, industrial valves and seals
- 345311 - Boilers and heat exchangers
- 3453111 - Heat exchangers and steam condensers
- 3453112 - Stationary and marine power boilers
- 3453113 - Nuclear reactor steam supply systems
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