26 REMOTELY CONTROLLED MATERIALS HANDLING EQUIPMENT, CONTROLS, MOUNTING MEMBERS AND PARTS AND ACCESSORIES THEREFOR, SAID ACCESSORIES INCLUDING REPLACEABLE REMOTELY CONTROLLED MANIPULATOR HANDS, AND TOOLS INCLUDING IMPACT WRENCHES, SCREWDRIVERS AND OTHER ELECTRICALLY POWERED HAND TOOLS, AND CHANGE FIXTURES FOR SUCH POWER TOOLS AND REPLACEABLE HANDS, AND PROGRAMMING DEVICES FOR SEQUENTIAL OPERATION OF MATERIALS HANDLING EQUIPMENT