Abstract: An apparatus in which at least two sheets are stapled to one another. The apparatus includes a controller which places a pressure source in communication with a staple drive so that pressurized fluid actuates the staple drive to drive a staple through the sheets. Thereafter, the controller places the staple drive in communication with a staple clincher so that the pressurized fluid exhausting from the staple drive actuates the staple clincher to clinch the portion of the staple legs protruding through the sheets.

Abstract: Core barrel apparatus and a method for obtaining and retrieving sealed core samples of subterranean formations are disclosed. The core barrel apparatus comprises inner and outer core barrels. The upper portion of the outer core barrel is adapted to be connected to a drill string. A core bit for cutting a core sample is mounted on the lower portion of the outer core barrels. The inner core barrel comprises a sample chamber for receiving a core sample as it is formed at the bottom of a bore hole and an expansion chamber for receiving sample fluids. The sample chamber and expansion chamber are selectively connected to one another. The expansion chamber is sealed closed while the sample is being cut and received within the sample chamber. The lower portion of the sample chamber adjacent the core bit is sealed by a flap-valve which includes a flexible flap member.