19,273. Wanderer-Werke vorm. Winklhofer & Jaenicke Akt.-Ges., and Greve, J. E. W. Aug. 22. Adding - apparatus with operating-means. -In key - set leveroperated calculating- apparatus, (1) a depressed key in any bank is latched by a pivoted spring - controlled denominational locking- bar, which permits the actuation of a second key in the same bank and the release of the key first depressed; (2) the series of denominational locking-bars is carried by a sliding frame, the movement of which, at the commencement of the operating movement, locks the entire keyboard, but releases it again before the completion of the operation so that a second item can be set thereon; (3) means are provided for giving t h e denominational stepped members a small movement to cause zeros to be printed, and for releasing them when it is desired to print totals and sub-totals; (4) the totals of separate columns can be printed independently. There is provided also (5) an error key, (6) a multiplying or repeat key, and (7) means for printing serial numbers, when the machine is to be utilized to print a column of such numbers and a corresponding column of items, requiring only the depression of the key representing the changing units' digit of the serial number. Keyboards.-The depressed key is latched by one of the series of denominational locking- bars 59, shown in end view in Fig. 3. The upper side of this bar engages in a notch in a projection 66 in the key-stem; the depression of a second key rocking the bar and releasing the key first depressed. The latching movement of the bar 59 releases the corresponding latch 79 for the differential stepped member 77. Depressed keys are released by means of a releasing-rod 67, Fig. 2, actuated by the operating-lever through an arm 89, lever 89<a> carried thereby, lever 69<a>, and the hooked lever 90. Keyboard interlocks.-The operating-lever 7<a>, Fig. 1, rocks a cam-sector 72, thereby actuating a lever 73 and moving the sliding carriage 62 carrying the pivoted locking-bars rearwards. This movement displaces notches in the locking- bars so that they no longer register with projections 70 on the key-stems, and thereby prevent the actuation of any undepressed key. The sector 72 is made in two toothed parts normally latched together, but at the end of the forward movement of the handle, the latch is tripped so that towards the end of the return stroke of the handle the spring-controlled lever 73 engages the forward member, and depresses it against its spring. The carriage 62, with the locking-mechanism, thus returns to its normal position. Controlling printing of zeros; printing totals and sub-totals.-If no keys are depressed in any banks, the differential stepped members 77 move forwards until projections 78 thereon engage projections on the latches 79, in which case the zero type will be in position to print. When the total or sub-total printing-lever is actuated, a slotted bar 83, Fig. 1, is slid to the left so that the slots no longer register with the projecting upper portions 79<a> of the latches 79. When the carriage 62 is moved rearwards at the commencement of the operation, the bar engages the latches 79, releasing the differential members 77. Totals and sub-totals are thereupon printed in the usual way. Printing totals of separate columns independently. Two keys 85, Fig. 1, are provided, and are connected to bails 84, adapted to move into the path of projections 77<a>, upon the differential members 77, of the left and right sections respectively of the machine, and to prevent the printing of a total in the corresponding section. Error keys.-A key 69, Fig. 2, is adapted to rock the lever 69<a> (which is normally actuated at every operation by the operating-lever 7<a>), and slide the releasing-rod 67 so as to disengage the locking-bars 59 from the depressed keys. Multiplying by repetition.-Actuation of the multiplying or repeat key 92, Fig. 2, rocks the hooked lever 90 disengaging its other extremity from the lever 69<a>. The releasing-rod 67 is therefore not actuated so long as the lever 90 is in this position. Printing-mechanism for identifying-numbers. The releasing-rod 67 is in two portions 67, 67<a> normally held together by a latch 87. The point of division is situated at a position immediately to the left of the bank that will normally be employed to set and print the right-hand figure of a succession of serial identifying-numbers. Consequently if the consecutive-number key ' 88 be depressed, and the latch 87 disengaged, only those keys to the right of the point of division will be reset by the part 67 of the releasing-rod, the part 67<a> remaining stationary.