Abstract: A resealable envelope is provided which has a simple and inexpensive construction. This envelope includes two paper panels disposed in face-to-face relation with one panel having an extending portion to provide a sealing flap. A first plastic strip fixedly secured to the inner face of the flap, a second plastic strip fixedly secured to the outer surface of the panel which the flap engages to close the envelope, and a pressure sensitive contact adhesive applied by a removable tape to one of the plastic strips provide a seal for the envelope.

Abstract: Apparatus and method are disclosed for continually generating data values (M) indicative of the time dependent waveform of the current (I.sub.C) in a control rod latch actuation circuit (28), during application of a pulsed drive voltage (30). A data value is selected that represents a value limit (M.sub.min) characteristic of the waveform during the time before the latch (14) has reached a critical position of interest. The most recently generated data value (M.sub.N) is compared to the value limit (M.sub.min), and a control signal (e.g., 74, 52, LH) is generated when the most recently generated data value (M.sub.N) exceeds the value limit (M.sub.min). The data values (M) preferably indicate the time derivative of the waveform (I.sub.C) at a plurality of predetermined times during application of the drive voltage.