Fuente: Wipo "digitalization" 693,014. Automatic exchange systems. AUTOMATIC ELECTRIC LABORATORIES, Inc. Oct. 25, 1950 [Oct. 26, 1949], No. 26028/50. Class 40 (iv). In a translator common to a group of register-controllers, the translations corresponding to the various office codes are recorded magnetically on a rotating drum and are generated in succession during one revolution thereof. When the translator is seized by a registercontroller, the office code is transferred to registers therein and a coincidence detector which receives impulses on a 3-digit counter as the drum rotates from its zero position causes the opening of an electronic gate at the proper time to allow the required translation to pass to the registercontroller. Different translations are provided according to the class of calling party, and, where the system provides for alternative routing, an alternative translation is available when the direct route is busy. General arrangement. The drum 1311 is capable of bearing 10,000 longitudinal rows of magnetized spots which pass under spaced pick-up heads as the drum rotates. Ten rows are allotted to each 3-digit office code to supply 3 translations corresponding to the various classes of the calling party and a fourth translation if alternative routing is provided. The translations are recorded in 4-unit code form and comprise routing digits, one or more rate digits and certain control signals. Each row includes an indexing spot which in passing under a pick-up head 1313A delivers a pulse, amplified at 1360, over wire C1338 to an electronic counter 1370, and the latter in turn controls similar units, tens and hundreds counters U1220, T1130, H1120, which thus indicate by their setting the translation being generated at any particular time. A single reset spot which passes under a pick-up head 1312A in the zero position of the drum serves to zeroize the counters. The translator is intended for use in the system described in Specification 692,999, the register-controller, Figs. 5-10, 15-18 (not shown), being similar to that disclosed therein. Certain offices are denoted by two code digits only, and the first numerical digit is then used to make up a 3-digit code. When the motor driving the drum 1311 starts, contacts 1340 close. When the reset spot is picked up in the zero position of the drum, tube 1351 is cut off and tube 1350 fires, so that relay R1335 operates to ground wire C1337 to make the translator available for use. Also, a positive pulse is applied to wire C1339 to zeroize the counters 1370, U1220, T1130 and H1120, each of which comprises ten pairs of trigger tubes. Operation. The translator is seized by the operation of relays R1220, R1230 after three digits have been received in the registercontroller, and these digits are recorded on relay registers H, T, U. In addition, one of the class relays R1345, R1350, R1355 is operated in series with R1340. R1210 then energizes and applies positive grid bias to tube 1202A in a pick-up pulse circuit 1201, the purpose of which is to prevent transmission of an incomplete translation. At each 10th pulse received by the counter 1370, tube 1202A is fired by a positive pulse on its screen grid and cuts off tube 1201A. The tubes of the gates 1250, 1260 have their grids connected over C1280 to positive potential which, however, is reduced to an ineffective value as long as tube 1201A or any tube VH, VT, VU of the coincidence detector is conductive. As the units counter U1220 advances, wires C1250-C1259 are marked in succession with high + potential and C1260-C1269 with low + potential. As long as no digit is recorded in the units register relays U, the first set of wires are effective and tubes VU fire in succession. When one of the relays is operated, however, it prevents the firing of the corresponding tube by switching over the connection to a wire of the other set. In the same way the counters T1130 and H1120 operate in conjunction with the tens and hundreds registers to control tubes VT, VH. Thu