Roscoe Moss Co. makes a variety of well screens, including the MossWell shutter screen. This type of screen is particularly suited for use in large diameter, deep, gravel envelope wells. Wells of this type often utilize formations characterized as thick, average-yielding aquifers consisting of sands and gravels. Shutter screens work well with these wells because they are designed to be hydraulically efficient, strong and durable. The smooth, unobstructed interior of shutter screen allows for the use of development techniques such as swabbing. Roscoe Moss Co., Card No. 298