US3891980A - Security systems - Google Patents

Security systems Download PDF

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Publication number
US3891980A
US3891980A US304560A US30456072A US3891980A US 3891980 A US3891980 A US 3891980A US 304560 A US304560 A US 304560A US 30456072 A US30456072 A US 30456072A US 3891980 A US3891980 A US 3891980A
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United States
Prior art keywords
signal
control unit
token
frequency
loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US304560A
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English (en)
Inventor
John Lewis
William Dudley Gilmour
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Lewis Security Systems Ltd
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Lewis Security Systems Ltd
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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/27—Individual registration on entry or exit involving the use of a pass with central registration
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00777—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by induction
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
    • G07C2209/64—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle using a proximity sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S70/00—Locks
    • Y10S70/49—Locks with alarm

Definitions

  • a security system includes at least one portable token capable of transmitting oscillations at a predetermined frequency, a control unit arranged to detect whether oscillations at the predetermined frequency are being picked up at a certain location and means for operating a deterrent by the control unit.
  • the system is preferably a radio system.
  • the persons can have tokens with different transmitters dependent on their degree of authority and a pick-up and radio receiver associated with a particular area and forming part of the control unit can be arranged to control a door or opening constituting the deterrent to restrict entry to persons having transmitters transmitting one frequency, or any one of a number of particular frequencies or those frequencies so modulated by other frequencies.
  • the transmitters can be arranged to be operated continuously so that provided a person has the transmitter on his person he can have access to the area without having to take any action on entry.
  • the transmitters could operate from batteries which are recharged or replaced from time to time and an extension of the system can ensure that no person can take one of the transmitters out of the establishment area, or bring one in.
  • the detector can be arranged to give an alarm, whether audible or inaudible, that an unauthorised person is approaching the security area or can be arranged to unlock or not unlock a gate or open or not open a door controlling access to the area, or to take a photograph of any unauthorised person, or any combination of these or similar actions.
  • the system may include a sensor responsive to the presence of a person to initiate a detection cycle in the control unit which will set off an alarm or take other appropriate action if not cancelled by receipt of one of the particular frequencies within the period of the cycle which might be conveniently of the order of one second.
  • the sensor could be a switch operated by the weight of someone approaching or a photoelectric device or a passive or active acoustic device, or a capacitive device, or a detector using micro-waves or any other form of detector.
  • the sensor can be constituted by a pick-up of the transmitted signals from the token.
  • the pick up might use an inductive loop system for picking up transmissions and this could be let into a wall and/or a ceiling in a passage approaching the security area so that it would not matter in what attitude the person was carrying his transmitter.
  • a single control unit can operate with a number of deterrents and a number of tokens and a number of gates at a number of levels of security.
  • the control unit includes means such as a local oscillator at a frequency displayed from the predetermined frequencies for providing a local reference signal and means responsive to the picked up signal response and the local reference signal to produce beat frequency pulses and a detector circuit arranged to distinguish between beat frequencies above and below a certain limit.
  • control unit includes a counter and a low pass filter for cutting off frequencies outside a permitted range from the counter, the permitted range of frequencies including the beat frequency.
  • the beat frequency pulses can be counted over a known time interval to see if the received frequency is close enough to the local frequency.
  • the local frequency can be modulated by a few Hz for a fraction of the detection cycle and not for the remainder of the cycle and beat frequency cycles can be counted in one sense for the fraction of the period and in the other sense for the remainder of the period.
  • the fraction will be preferably one half of the period.
  • the net count over the examination period will be dependent upon the frequency at which the local oscillator is modulated for the part period and so the detector of the count can distinguish between the beat frequency derived from the correct transmitter frequency and the same beat frequency derived from the image frequency.
  • FIG. 1 is a diagram illustrating the general principles of a security system embodying the invention
  • FIG. 2 is a diagram showing how different pick up loops in the system can be inter-connected to avoid a null, and;
  • FIG. 3 is a block diagram of some of the components of the control unit shown generally in FIG. 1.
  • the system is for controlling access to different restricted spaces and in the example being described, two doors 11 and 11 are shown diagrammatically in relation to passage 13.
  • the doors are normally locked closed but are to be opened automatically to permit the entry of any person having an appropriate token, but not to be opened to others.
  • a sensor 15 detects his presence and sends a signal to a central control unit [6 which is rendered active to examine whether the persons who operated the sensor 15 is carrying a correct token 20. If so, a signal is supplied at 17 to open the door 11 automatically, but if not, the door remains closed and/or an alarm is given and/or a photograph of the person is taken.
  • a second photoelectric sensor (not shown) responsive to a person going through the open doorway can cause an alarm to be given if an unauthorised person passes through after an authorised person before the door has closed again. The authorised persons token will prevent the alarm being given as he goes through.
  • the signals are detected by an arrangement of inductive loops indicated generally at 18 in the passage by which the door is approached and signals picked up by the loop 18 are fed at 19 to the control unit 16.
  • the Sensor 1 The sensor may be a photo-electric device or a weight-mat or a door handle switch or an infra-red device or indeed any device that can detect the presence of a person in a particular position and it is only required to supply an activating signal to the control unit.
  • the Loop System 18 Many different loop systems are possible depending on the particular application but the system being described uses a three-loop system which avoids a null so that it does not matter in what disposition the user is carrying his token.
  • one inductive loop H is arranged to lie in a horizontal plane, and may, for example, be embedded in the floor or ceiling of the passage 13.
  • a second inductive loop V is arranged to lie in a vertical plane which is parallel to the path of people entering the security area, and may, for example, be embedded in the wall of the passage.
  • the third inductive loop D lies in a plane which is mutually perpendicular to the planes containing the loops H and V, and may, for example, encircle the passage, so that a person entering the security area will walk through the inductive loop D.
  • the system is arranged, as hereinafter described, to admit, or exclude, or give warning of, a person even when only one of the loops is picking up a signal.
  • the signals produced in them by a transmitter will be approximately in phase (or anti-phase).
  • the signal from the loop H passes to a phase shifting circuit 24, which re tards it by a phase angle of 45, while the signal from the loop V passes to a phase shifting circuit 25, which advances it by a phase angle of approx. 45.
  • phase shifting circuit 24 which re tards it by a phase angle of 45
  • phase shifting circuit 25 which advances it by a phase angle of approx. 45.
  • the signal from loop D is added to the output of adder 26 by an adder circuit 27, and subtracted from it by a subtractor circuit 28. In this way it is ensured that if any ofthe loops H, V and D is receiving a signal, it is impossible for the outputs of both adder 27 and subtractor 28 to be zero.
  • Two phase shifting circuits 29 and IN and an adder circuits 32 which function in the same way as the circuits 24, 25 and 26 respectively, ensure that an output is produced under all conditions except when there is no output either from adder 27 or from subtractor 28.
  • the Token This is a multi-frequency oscillator in a sealed plastic cassette to be tamper and shock proof and to be resistant to changes of temperature and humidity. It is operated by a chargable battery carrying a 20 hours charge. It is about the size of a small packet of cigarettes.
  • a token is arranged to generate signals at 2 discrete frequencies in the range 50 to KHZ and only opens a door 11 designed for these two discrete frequencies.
  • the frequencies need to be at least 20 Hz apart and this gives 5000 possible frequencies so that there are 25,000,000 possible combinations of the two frequencies.
  • the token employs two crystal-controlled oscillators and a ferrite rod aerial. It transmits continuously at the two frequencies, being re-charged at night when not being used. Alternatively it can be a passive generator which is excited into oscillation when it approaches the door by a signal generated in the loop system.
  • the Control Unit 16 This is in a central consule and receives signals over lines 12 from the sensors 15 disposed throughout the plant in relation to all the doors 11, and from their associated loop system 18, and also controls the transmission of unlocking or alarm signals over lines 17 to the associated doors.
  • the unit includes a battery charger and a number of lockable sockets indicated generally at 32, into each of which one of the tokens can be inserted at night for recharging the batteries. There is also a check that all tokens have been returned and have not for example been taken home accidentally by the users.
  • the unit may keep a record of the times at which tokens were withdrawn and the times at which they were replaced to keep a record of the hours during which persons were on the premises.
  • the control unit can provide on a display board a single visible display of the condition of the various doors and of the presence or otherwise of the various tokens and there may also be one or more remote displays controlled from the unit 16.
  • An additional feature is an exit loop detector at the exits from the premises which gives a signal if any person tries to leave the premises whilst still carrying his token.
  • the unit 16 may have a pre-programmed timer so that at different times of the day different persons have access to the premises. For example cleaners may be allowed in at certain hours when it is known that the equipment to be protected is separately locked or guarded.
  • the signals from a pick-up coil 18 are received at 19 by a radio frequency amplifier 35 whose output is fed to two different detecting circuits. one for each of the two discrete frequencies to which that door 11 is to be responsive.
  • the output from the amplifier 35 is fed in parallel to two mixers 36, and 36' each of which also receives an input from a local oscillator 37 or 37'. Since tht two detector circuits operate in precisely the same way except for the particular frequency to which they are responsive, only one of the detectors will be described in detail.
  • the associated local oscillator 37 will be arranged to oscillate at a frequency displaced from that frequency by a few Hz, for example 90,039 Hz and the output from the mixer 36 if the correct frequency is being received at 19 will be a beat frequency of 1 Hz, which is fed to a unit 38 including a low pass filter cutting off at 20 Hz and a pulse shaper.
  • the pulses from 38 are fed in parallel to an up gate 39 and a down gate 4] controlled from a square wave clock generator 42 with a cyclic period of 400 milliseconds, and also from signals received at 43 from the sensor associated with the particular door 11.
  • a sensors signal at 43 renders the gates 39 and 41 active to count beat pulses from the unit 38, each for the duration of respective 200 milliseconds halves of the square wave from the clock generator 42. This is achieved by an inverter 60 in the connection from the generator 42 to the down gate 41.
  • the clock generator is free running and does not need to be synchronized with the sensor signal.
  • the local oscillator 37 is also controlled from the clock generator 42 in such a way that the local frequency from oscillator 37 is reduced by 9 Hz during one up part of the detecting cycle which detecting cycle is established by the two, 200 millisecond halves of the square wave from the clock generator 42.
  • a received frequency of 90,040 Hz would produce 2 beat pulses, and for a second, down part it would produce 0 beat pulses.
  • the gate 39, the up gate counts up to 4 pulses while it is active, it passes a 1 signal to an accept gate 44, but if the count is 5 or more, it passes an 0 signal.
  • the gate 41, the down gate passes a l signal to a non-accept gate, 45 if it counts 0 2 pulses while it the down gate is active, and passes an 0 signal if it counts more than 2 pulses.
  • the gates 44 and 45 pass logic signals to a final counter 52.
  • the final counter 52 is switched on at 50 by a pulse from a unit 58 driven the signals from the by clock 42 and triggered by the sensor 43 so that the counting of counter 52 coincides with the signal from the gates 39 and 41.
  • Beat pulses at a frequency above per second will be filtered out at 38, and therefore incoming frequencies above 90,045 Hz and below 90,010 will not provide the appropriate beat pulses at 39 and 41, and at the final counter.
  • Incoming frequencies in the range 90,010 to 90,025 and in particular the image frequency 90020 will not product a net count of0 2 in the down gate 41, and so the receiver can be sensitive to the narrow band 90,025 to 90,045.
  • the final outputs from the counter 52 for both discrete frequencies are examined in a logic unit 54 which is capable of passing an accept signal at 55 to unlock the door 11 over the line 17. There may have been no accept signal because the final count was greater than 4 possibly due to extraneous pulses, or because the incoming frequency was too far displaced from the local oscillator frequency giving a count of 0'; accordingly it is arranged that a second look is automatically made.
  • a second look signal is fed from the logic unit 54 to the final counter at 61 and when the next signal appears at 50 after a delay of 0.5 seconds sufficient to complete the detecting cycle the unit is reset at 57 and a further detecting cycle is performed to see if this time the correct number of net beat pulses is counted.
  • warders could carry the tokens and could have a choice of two frequencies on one token, either of which would open the door, but one of which would also sound an alarm.
  • a security system including at least one portable token embodying a generator and transmitter of oscillations at a predetermined frequency, a pickup at a certain location and means in the pickup for responding to the oscillations transmitted from the token when the token is carried in any atatitude by a user who comes to the location, a sensor responsive to arrival of a person at the location, and a control unit rendered ope rative by response of the sensor and having means for providing a local reference signal, means responsive to the pick-up response and the local reference signal for forming an output signal, and means receiving the output signal for detecting whether the pickup is responding to oscillations at the predetermined frequency, and to deliver a control signal to dependence upon such detection.
  • a system as claimed in claim 1 in which the token is capable of simultaneously transmitting oscillations at two different predetermined frequencies and including means in the control unit for detecting whether oscillations at both the predetermined frequencies are being picked up by the pickup.
  • a system as claimed in claim 1 including a plurality of tokens at least one of which is capable of transmitting oscillations at at least one predetermined frequency and at least one other of which is capable of transmitting oscillations at at least one different frequency, and means in the control unit for detecting whether the one predetermined frequency is present at one location and whether the different frequency is present at another location.
  • control unit is arranged to deliver a control signal whether the one or the other frequency is present to be picked up at one of the locations.
  • a system as claimed in claim 1 in which the or each token is arranged to transmit continuously without requiring any action by the person carrying it.
  • a security system as claimed in claim 1 additionally comprising a socket for each token and a battery charger for automatically charging batteries in the tokens when they are inserted in their sockets.
  • control unit includes a local oscillator oscillating at a frequency displaced from the predetermined frequency for producing beat frequency pulses and a detector circuit for distinguishing between beat frequencies above and below a certain limit.
  • a system as claimed in claim 8 in which the beat frequency pulses are passed through a low pass filter in the control unit for cutting off beat frequencies outside a permitted range.
  • a system as claimed in claim 9 including in the control unit a counter gate for counting beat frequency pulses over a predetermined time interval and means for detecting whether the count achieved is greater or less than a predetermined count.
  • a system as claimed in claim 10 including means for the control unit for detecting whether no pulses are received over an interval and means connected to the counter gate and providing a wave signal for delimiting the inverval.
  • a system as claimed in claim 10 including a logic circuit arranged to give an accept signal for controlling the deterrent in dependence on the count of the counter.
  • a system as claimed in claim 13 including means for giving no alarm if, but only if, an acceept signal is given after at least two detection cycles.
  • a system as claimed in claim 8 including in the control unit means for modulating the local oscillator frequency by a few cycles for a fraction of a detecting cycle and not for the remainder of the cycle, means providing a wave signal for delimiting the detecting cycle and means responsive to the wave signal for delimiting fractions of the cycle.
  • a system as claimed in claim l5 including in the control unit gates for counting beat frequency pulses in one sense for the fraction of the cycle and in the other sense for the remainder of the cycle.
  • a security system as claimed in claim 1 including a deterrent and means responsive to the control signal for operating the deterrent.
  • a security system as claimed in claim 1 including an exit loop detector at an exit from premises and in which the control unit responds to a signal from the exit loop detector due to a token being taken through the exit.
  • a security system for operating a deterrent comprising:
  • token having means for generating and transmitting oscillations at two different frequencies
  • a loop system at a certain location in the system for providing an output signal including the oscillation frequencies from the token, the loop system having two inductive loops in substantially perpendicular planes for picking up the oscillations from the token when the token is carried in any attitude near the location of the loop system and means combining the signals from the loops for providing the output signal;
  • control unit receiving the output signal from the loop system for transmitting a signal operating the deterrent
  • control unit having a detecting system, the detecting system having two detecting circuits each receiving the output signal from the loop system and each having a local oscillator arranged to oscillate at a frequency displaced from that of a different one of the token oscillation frequencies in the loop system output signal, means mixing the loop system output signal with the local oscillator frequency for forming beat frequency pulses, and a gate arranged to count the beat frequency pulses during at least part of a signal from a clock for passing a signal having a 0 or 1 state dependent upon the counting of a predetermined number of beat pulses during the clock signal, the control unit also having a clock for providing the clock signal to each gate and means responsive to the state of the signal from each gate for providing the signal operating the deterrent.
  • a system as in claim 21 wherein the means combining the signals from the loops in the loop system comprise means for oppositely shifting the phase of the signal picked up by each loop and means adding each of the oppositely phase-shifted signals for providing the output signals.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Burglar Alarm Systems (AREA)
  • Lock And Its Accessories (AREA)
  • Radar Systems Or Details Thereof (AREA)
US304560A 1971-11-08 1972-11-07 Security systems Expired - Lifetime US3891980A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2289872*[A GB1414119A (en) 1971-11-08 1971-11-08 Security system for responding to the movement of individuals
GB2289872 1972-05-16

Publications (1)

Publication Number Publication Date
US3891980A true US3891980A (en) 1975-06-24

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ID=26256172

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Application Number Title Priority Date Filing Date
US304560A Expired - Lifetime US3891980A (en) 1971-11-08 1972-11-07 Security systems

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US (1) US3891980A (nl)
JP (1) JPS5047597A (nl)
AU (1) AU472349B2 (nl)
BE (1) BE791039A (nl)
CA (1) CA997445A (nl)
CH (1) CH577723A5 (nl)
DE (1) DE2254637A1 (nl)
ES (1) ES408555A1 (nl)
FR (1) FR2159362B1 (nl)
GB (2) GB1414119A (nl)
HK (2) HK29681A (nl)
IL (1) IL40760A (nl)
IT (1) IT973404B (nl)
NL (1) NL175557C (nl)
SE (1) SE392651B (nl)
ZA (1) ZA727892B (nl)

Cited By (90)

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USRE29610E (en) * 1973-04-13 1978-04-11 Knogo Corporation Field strength uniformity control system
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US4755799A (en) * 1986-02-27 1988-07-05 James Romano Microcomputer controlled combination lock security system
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US4763121A (en) * 1985-08-12 1988-08-09 Nissan Motor Company, Limited Keyless entry system for automatically operating automotive door locking devices without manual operation
US4779090A (en) * 1986-08-06 1988-10-18 Micznik Isaiah B Electronic security system with two-way communication between lock and key
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Also Published As

Publication number Publication date
JPS5047597A (nl) 1975-04-28
NL175557B (nl) 1984-06-18
IL40760A0 (en) 1973-01-30
NL175557C (nl) 1984-11-16
GB1414120A (en) 1975-11-19
CH577723A5 (nl) 1976-07-15
HK29681A (en) 1981-07-10
AU472349B2 (en) 1976-05-20
FR2159362A1 (nl) 1973-06-22
FR2159362B1 (nl) 1980-03-07
ZA727892B (en) 1974-06-26
DE2254637A1 (de) 1973-05-10
HK29581A (en) 1981-07-10
GB1414119A (en) 1975-11-19
AU4857872A (en) 1974-05-09
NL7215051A (nl) 1973-05-10
CA997445A (en) 1976-09-21
ES408555A1 (es) 1976-03-16
SE392651B (sv) 1977-04-04
IT973404B (it) 1974-06-10
IL40760A (en) 1975-10-15
BE791039A (fr) 1973-05-07

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