PPG Industries Inc. announced Wednesday it has reached a definitive agreement to acquire Avon, Mass.-based Cuming Microwave Corp. Financial terms of the transaction were not disclosed. It is expected to close in the third quarter, subject to customary closing conditions. The business is a wholly-owned subsidiary of Cuming-Lehman Chambers Inc., which is based in Chambersburg. Cumin Microwave is a global supplier of specialty coatings and materials that absorb microwaves and radio waves, such as...