Abstract: An improved power saw arrangement includes a base of the type which is adapted to rest on a flat, horizontal surface, a support member pivotally mounted to an upper surface of the base and a power saw assembly which is releasably secured to the support member. The power saw assembly is provided with an overhead handle portion and a U-shaped handle portion which wraps around its main body and is substantially perpendicular to the overhead handle portion. When secured to the support member, the overhead handle portion may be used, and the saw assembly can function as a chop saw. The power saw assembly can further function as a cut-off saw by unsecuring it from the support member and using the U-shaped handle portion. Novel structure for effecting releasability of the power saw assembly from the support member, and for limiting the pivotal motion of the support member relative to the base are also disclosed.

Abstract: A system for measurement and recording of data as to events and conditions is disclosed including a recorder unit adapted to be located at a surveillance site and connected to detectors providing successive signals responsive to successive actuations by individual events, and a portable reader instrument adapted to be connected to said recorder unit. The recorder unit has semi-conductor memory for data and for instructions of a program, and a programmable data processor operable under the control of a program of instructions stored in memory to function in a recording mode. The data processor includes an arithmetic and logic unit for performing computational and decisional processes in a sequence determined by a program to count events in response to the detector signals, and to classify and accumulate the counts as data in separate locations in semi-conductor memory for separate real time periods.