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  • Lead Grower Cory Swanson prepares a young marijuana plant for a hydroponic grow system at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

  • Surna CEO Tony McDonald stands inside an assembly room for a cooling device for growing plants on Thursday in Boulder.

  • Green Edge Trimmers employees Mario Arroyo, left, Alfred Petters and Michael McMaster trim marijuana at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

  • Surna employees Chad Mestas, left, and Justin Moats work to install insulation on a cooling system for growing plants on Thursday in Boulder.

  • Surna employee Justin Moats works to put insulation on a cooling system for growing plants on Thursday in Boulder.

  • Green Edge Trimmers employees Alfred Petters, at right, and Mario Arroyo trim marijuana plants at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

  • Marijuana growing equipment at a grow operation at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

  • Grower John Emmons puts a young marijuana plant in a hydroponic grow system at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

  • Sterling Pharms employee Zephyr May trims marijuana plants at Sterling Pharms on Wednesday in Boulder. Sterling Pharms uses equipment manufactured by the Boulder-based company Surna.

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