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Altra Industrial Motion Corp. engages in the design, production, and marketing of electromechanical power transmission motion controls. It operates through the Power Transmission Technologies, and Automation and Specialty segments. The Power Transmission Technologies segment focuses on the production of couplings, clutches, and brakes, electromagnetic clutches and brakes, and gears. The Automation and Specialty segment consists of brands such as Kollmorgen, Portescap, Thomson, and Jacobs Vehicle Systems (JVS). The company was founded in 2004 and is headquartered in Braintree, MA.

Albany International Corp., together with its subsidiaries, engages in the machine clothing and engineered composites businesses. The company operates in two segments, Machine Clothing (MC) and Albany Engineered Composites (AEC). The MC segment designs, manufactures, and markets paper machine clothing for use in the manufacturing of papers, paperboards, tissues, towels, pulps, nonwovens, building products, tannery, and textiles, as well as fiber cement and several other industrial applications. This segment offers paper machine clothing forming, pressing, and drying fabrics, as well as engineered processing belts; and engineered fabrics. The AEC segment 3D-woven and injected composite components for aircraft engines composite airframe and engine components for military and commercial aircraft. It operates in the United States, Switzerland, France, Brazil, China, Mexico, Germany, and internationally. The company was incorporated in 1895 and is headquartered in Rochester, New Hampshire.

Barnes Group Inc. provides engineered products, industrial technologies, and solutions in the United States and internationally. The company operates through two segments: Industrial and Aerospace. The Industrial segment offers precision components, products, and systems used by various customers in end-markets, such as mobility, industrial equipment, automation, personal care, packaging, electronics, and medical devices. This segment also designs and manufactures hot runner systems, mold cavity sensors and process control systems, and precision high cavitation mold assemblies for injection molding applications; provides force and motion control solutions for various metal forming and other industrial markets; and designs and develops robotic grippers, end-of-arm tooling systems, sensors, and other automation components for intelligent robotic handling solutions and industrial automation applications. In addition, it manufactures and supplies precision mechanical products, including mechanical springs, and high-precision punched and fine-blanked components used in mobility and industrial applications. This segment sells its products primarily through its direct sales force and distribution channels. The Aerospace segment produces fabricated and precision machined components and assemblies for turbine engines; and nacelles and structures for commercial and defense-related aircraft. It also provides aircraft engine component maintenance, repair, and overhaul services for turbine engine manufacturers, commercial airlines, and defense market; and manufactures and delivers aerospace aftermarket spare parts. This segment serves original equipment manufacturing industry. Barnes Group Inc. was founded in 1857 and is headquartered in Bristol, Connecticut.

PowerShares Build America Bond Portfolio (the Fund) seeks investment results that correspond generally to the price and yield performance of an index called The BofA Merrill Lynch Build America Bond Index (the Index). The Fund will normally invests at least 80% of its total assets in the securities that comprise the Index. The Index is designed to track the performance of the United States dollar-denominated Build America Bonds publicly issued by the United States and territories, and their political subdivisions, in the United States market. The investment advisor of the Company is Invesco PowerShares Capital Management LLC.

iRobot Corporation designs, builds, and sells robots and home innovation products in the United States, Europe, the Middle East, Africa, Japan, and internationally. The company offers floor care products, including Roomba floor vacuuming robots; Roomba accessories and consumables, such as the Clean Base Automatic Dirt Disposal, replacement dirt disposal bags for the Clean Base, filters, brushes, and batteries; Braava family of automatic floor mopping robots; and Braava accessories and consumables, which include cleaning solution, washable and disposable mopping pads, replacement tanks, and batteries, as well as subscription services. It also provides Root robots for coding, discovery, and play; Roomba Combo mopping and vacuuming robot; and accessories, including robot vacuum and mop, handheld vacuum, and air purifier, educational coding robot, and accessory bundles. The company sells its products through chain stores and other national retailers, value- added distributors, and resellers, as well as through its website and app, and e-commerce websites. iRobot Corporation was incorporated in 1990 and is headquartered in Bedford, Massachusetts.