Analog signals are generated in response to one or more operating parameters of a machine such as vibration and used to provide a log of the operating history of the machine. The bulk material handling accessory includes a controller having one or more sensors. The testing unit includes a headform upon which a protective mask to be tested is mounted. A socket assembly or a microelectronic element such as semiconductor chip may be mounted onto the first surface of the rigid interposer. The data sheet defines a data page bearing identification data of a subject and a connecting page made fixed with the cover sheet, and also comprises an intermediate layer of flexible material extending at the center line of sewing.