Regional branching and smart categories, the Institute measured and identified other pairwise industries (between industry x and industry y). [...] CLUSTER LINKAGES IN CANADA 3 LEGEND Industries strongly related to central cluster Represent each industry in the central cluster Industries loosely related to central cluster Cluster Name NAICS Industry Code. [...] NAICS Industry Name NAICS Industry Code NAICS Industry Name Central Cluster Cluster Name NAICS Industry Code NAICS Industry Name Cluster Icons Legend Central Cluster Strongly Related Industries Loosely Related Industries Notes: (1) Cluster definitions are based on the U. S. Cluster Mapping Benchmark Definitions developed by Professors Mercedes Delgado, Michael E. Porter, and Scott Stern (2013). [...] CLUSTER LINKAGES IN CANADA 4 CLUSTER LINKAGES Production Technology & Heavy Machinery 333318 Other Commercial and Service Industry Machinery Manufacturing Medical Devices Aerospace Vehicles 333314 and Defense Optical Instrument and Lens Manufacturing Industries in Aerospace Vehicles & Defense (7). [...] Construction, Mining, and Forestry Machinery and Equipment Rental and Leasing 212321 Construction Sand and Gravel Mining 532411.