Boston, MA 1/19/12 Keystone Tower Systems lead engineer Roz Takata (cq), second from right, talks with CTO Eric Smith (cq), on Thursday, January 19, 20012. She designed the company's laser scanner that's used to study the mechanical properties of pipes to make sure they're structurally sound. (This will aid in the development of new manufacturing techniques for wind turbine towers.) Keystone is one of the companies using incubator space in Greentown Labs, which is located in Boston's Innovation District. Also working on the mezzanine level of the building is Jason Ethier (cq), left, founder and CEO of Dynamo Micropower. (Pat Greenhouse/Globe Staff); Reporter: Michael Farrell; Section: Business; Slug: 23district