US3851602A - Safety box or the like - Google Patents

Safety box or the like Download PDF

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Publication number
US3851602A
US3851602A US00228867A US22886772A US3851602A US 3851602 A US3851602 A US 3851602A US 00228867 A US00228867 A US 00228867A US 22886772 A US22886772 A US 22886772A US 3851602 A US3851602 A US 3851602A
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United States
Prior art keywords
safety box
improvement
plastic material
box
conductors
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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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US00228867A
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English (en)
Inventor
W Lamping
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GAO Gesellschaft fuer Automation und Organisation mbH
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GAO Gesellschaft fuer Automation und Organisation mbH
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
    • E05G1/00—Safes or strong-rooms for valuables
    • E05G1/14—Safes or strong-rooms for valuables with means for masking or destroying the valuables, e.g. in case of theft
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05G—SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS
    • E05G1/00—Safes or strong-rooms for valuables
    • E05G1/10—Safes or strong-rooms for valuables with alarm, signal or indicator

Definitions

  • a timing circuit may be provided to operate, in case of a breaking in of the box,
  • a temperature supervising device is [56] References cued provided to assure a reliable operation of all the de- UNITED STATES PATENTS tector devices and current sources, and can also re- 126,289 4/1872 Guernsey 109/41 UX spond in case the box is attempted to be cut open by 181,078 8/1876 Larned 1.. 109 41 X a torch. 483,728 10/1892 Stromberg 109/41 1,686,457 10/1928 Mcc11m61 340/273 13 Clams, l2 Drawmg Flgulfes @EZE 31974 M my 6,
  • the present invention relates to a so-called safety box, i.e. to a container aimed at protecting the possessions contained therein from unauthorized access.
  • a so-called safety box i.e. to a container aimed at protecting the possessions contained therein from unauthorized access.
  • Such types of boxes are used in particular for the transportation and safe-keeping of all kinds of securities, such as bank notes and share certificates, as well as other documents, working drawings, contracts, and similar papers.
  • Intrusion detector systems providing a burglar alarm are primarily unsuitable for application to portable boxes or containers, because attempts for opening them are usually made at some unknown location. Moreover, the efficiency of any burglar alarm system is fundamentally substantially restricted by the fact that it serves its purpose only in cases where there is available a sufficiently quick reaction. Accordingly, deficiencies are involved which are mostly not at all avoidable for organisational reasons. But also the mechanical protection of the portable containers or boxes is not particularly sufficient, because they can always be opened somehow with the aid of suitable means. The fact that the number of money transport robberies, for example, is comparatively much higher than the number of burglaries into a stationarysystem, shows up these deficiencies very clearly.
  • the invention is based on the problem, by avoiding the aforementioned deficiencies, of providing in particular a portable safety box.
  • the invention itself is based on the aforementioned recognition that a mechanical forced entry into the room to be protected is practically always possible, and that the burglar alarm may often be too late.
  • the fundamental idea of the invention is based on making useless or destroying either completely or partly the contents of the room or box to be protected in the case of an unauthorizedattempt to break in.
  • For detecting such attempts at burglary there may then be used means known per se from the fields of instrusiondetection engineering but which, according to further features of the invention, are in particular adapted to the basic idea of invention.
  • for initiating the making useless or destruction of the contents to be protected there may also be used means known per se from other related fields of application.
  • the invention utilizes the known principle of laying out or imbedding into the walls of the safety box closed-circuit supervisory conductor loops. Since, however, such loops in principle are easily and quickly bridged, so that the alarm device is thus put out of service, in accordance with the invention the conductor loop or the conductor loops are so arranged as to form many iregular windings which are electrically isolated from each other. In case of destruction or interruption of the conductors or conductor loops, either an alarm is tripped, in a known manner, or the contents of the safety box are destroyed or permanently modified. Due to the chaotic arrangement of the conductor loops,
  • the safety can be improved still further if, in addition to the closed conductor loop or loops, there are also arranged open conductors, having a voltage applied thereto, which are either twisted with the conductor loops or arranged very close to the conductor loops. With this arrangement, it is nearly impossible to avoid producing a short circuit during intrusion attempts.
  • an effective and important further increase in safety can be obtained by providing a timing circuit effecting a relation between a safety factor and destruction, by attaining, in the case of an attempt to break into the box, destruction of the contents quicker than the time required for opening the box.
  • a temperature supervision is provided, in addition, and assures a reliable operation of all devices and current sources.
  • This temperature supervision can also respond to trigger an alarm or the like when an attempt is made to open the box by torch cutting.
  • FIG. 1 is a schematic sectional view of a novel safety box embodying the invention
  • FIG. 2 is a sectional view showing part of a foil, comprising a conductor loop, attached to the inside wall of the box;
  • FIG. 3 is a view similar to FIG. 2 but illustrating a simplified section
  • FIG. 4 is a schematic wiring diagram of a closedcircuit supervised double-conductor loop
  • FIG. 5 is a partial plan view of a foil upon which a conductor has been evaporated
  • FIG. 6 is a schematic wiring diagram of a circuit for effecting the closed-circuit supervision of an individual loop
  • FIG. 7 is a schematic wiring diagram of a circuit for effecting the closed-circuit supervision of a double loop
  • FIG. 8 is a combined schematic sectional view and schematic wiring diagram illustrating a depreciating device in accordance with the invention.
  • FIG. 9 is a perspective view illustrating the safety box opened so that its interior is visible
  • FIG. 10 is a perspective view illustrating the walls of the safety box, with a foil thereon, as disconnected rnechanically from each other;
  • FIG. 11 is a combined exploded perspective view, schematic wiring diagram and sectional view illustrating the foils with the conductor loops and their connection to the evaluating circuit and to the depreciating device;
  • FIG. 12 is a view similar to FIG. 7 but illustrating the loops as loops rather than as resistances.
  • FIG. 1 schematically shows the new safety box.
  • 'It consists of the housing 1, with the cover 2 and the lock 3, the timing circuit 5, the depreciating device 6, the box contents 7 and the evaluating circuit 8.
  • connection 4 serving to connect the cover 2 and the housing I. with one another in such a way as to obtain a closed safety system.
  • FIG. 2 shows a part of the walls 9 of the safety box, with the interior surfaces of these walls being lined with electrically non-conducting foil 10 into which are imbedded electrical conductors l2.
  • Foil 10 preferably is formed from a plastic composition material having special properties, as will be described hereinafter. It will be noted from FIG. 2 that the conductors 12 whose terminals 11 extend to the timing circuit 5 or to the supervisory circuit 8, respectively, are embedded in the foil 12 in a confused or, irregular as possible, and vague or disorderly manner. The significance of this arrangement will be explained in greater detail with reference to FIG. 3.
  • the foil is non-transparent and, on the other 7 hand, in the case of correspondingly thin conductors, there will be obtained such a high number of conductors, per unit of volume, that any'attempt, of the kind described hereinbefore, would be condemned to be a failure from the beginning.
  • any'attempt, of the kind described hereinbefore would be condemned to be a failure from the beginning.
  • a commercially available copper wire of 0.025 mm diameter there would be obtained a density of 400 conductors per mm.
  • FIG. 4 shows a particularly favorable arrangement of such closed-circuit supervised conductors.
  • the conductors 12 are arranged to extend close to one another, with a current flow being registered by the indicator 18 in the closed conductor loop via the source of current 17, while no current flows in the open loop. Since the open and the closed loop are positioned closely adjacent each other, it is practically impossible not to cause a short circuit between the two of them. In this case, however, there results the difference between the insulation'resistance of the foil and, in the most unfavorable case the resistance of the two series-connected conductor loops which lends itself particularly well for evaluation purposes. This would also exclude any probable attempts of drilling or boring in a liquid of the conductive type.
  • FIG. 5 shows the foil 19 on which the conductors 20 are either evaporated or deposited by way of etching. Several such foils may be stuck on to one another. Supervision may be carried out according to FIG. 4. On the other hand, conductors may also be evaporated in an areal manner on both sides of the foil 19 for permitting in this way a capacitive evaluation.
  • the efficiency of the safety system can be further increased.
  • a non'transparent plastics material as the embedding material, Le. a plastics material having the same or a higher melting point than the insulation material of the conductors. In this way it is achieved that a short circuit will result compulsorily in the'event of any cutting or melting attempts.
  • very brittle embedding materials which would break responsive to being worked upon mechanically, thus likewise destroying the conductor loops as embedded therein.
  • embedding materials having the same acid resistance as the lacquer insulation of the conductors. This would likewise cause a short circuit when trying to dissolve the insulation. Further properties of the materials might be of the chemical kind, such as decomposition when coming into contact with air, and the like.
  • Another property when using foils may be that the adherence of a conductor strip on the foil is smaller than the adhesion which is produced when sticking or cementing one foil on to another one by using a certain kind of adhesive. In this way it can be achieved that the conductor lead of the lower foil is compulsorily torn off when removing the top foil.
  • the principle of supervising the conductor loops is shown in FIG. 6.
  • the conductor 24 represented as a resister, is controlled or checked via the Darlington amplifier 24. In in the event of a resistance variation, a signal variation 23 will result at the output 22 serving to trigger the depreciating device 6.
  • FIG. 7 shows one possible type of circuit comprising two complementary Darlington amplifiers for very long and, consequently, high-resistive conductor loops which will be easily understood with reference to FIG. 6.
  • both the source of current and the electronics operate objectionably at temperatures ranging from -30 to +l00 C.
  • the temperature control is so designed as to respond upon reaching one of these limit values for actuating the depreciating device, thus safeguarding the proper functioning of the safety box under all-circumstances.
  • well-known means such as bimetal, or the like.
  • Another functional unit of the safety box consists of the timing circuit 5, for which known devices of the electrical or mechanical type may be used. This unit forms an important part of the novel safety box, and serves to make it absolutely unattackable.
  • the latter may be adapted to the given problem, i.e. it can be made smaller and, consequently, more simple in cases where only short-lasting transportation is involved.
  • For ascertaining the correlation factor between time and conductor density one may start from the fact that the unauthorized user is operating under optimum conditions and has tools at his disposal, so that it is very easy to calculate how much time would be required under optimum conditions for overcoming the safety system.
  • FIG. 8 schematically shows a coloring (inking, dyeing) device.
  • the circuit Upon closing of the switch 25 by the evaluating circuit 8, the circuit is completed across the battery. Chopping of the battery current is effected in the chopper 26 and stepping up of the current is effected by the ignition or sparking coil 27. Via the discharge or sparking gap 28 there is effected the firing of thesolid or liquid propellant charge 29. The pressure caused by this detonation opens the partition wall 32 and presses the reaction agent 30 through the predetermined breaking points 31.
  • These predetermined breaking points for example, are designed in the form of the well-known bursting diaphragms.
  • gases especially in cases where special labels or indications are used on the contents of the box, such as heavy metal salts (activators) or the like, or else in cases where the base is treated or mixed with certain chemicals.
  • the depreciating device can be replaced or completed by conventional types of alarm, such as sirens, transmitters, light signals, and the like.
  • a portable safety box for transporting valuables of the type including intrusion-resistant closure walls having incorporated therewith externally invisible electric conductor supervisory loops, connected in a closed circuit with a source of potential and an intrusion responsive device, operable, when a conductor is interrupted, to activate the intrusion responsive device
  • the improvement comprising, in combination, plural irregularly and randomly arranged conductor loops incorporated with each wall of said box and arranged closely adjacent each other, and each forming a closed circuit with a source of potential and said device; whereby said device is activated responsive to interruption of any one of said loops; and means operatively associated with said device and operable, responsive to activation of said device, to at least substantially modify the contents of said safety box in a lasting manner.
  • the improvement claimed in claim ll further including, in incorporation with each wall, plural irregularly and randomly arranged open conductors forming open conductor loops and each arranged closely adjacent a respective closed conductor loop; and a source of electric potential connected to said open loop conductors to apply an electric potential thereto.
  • the improvement claimed in claim 6, including a first adhesive adhering the superposed layers of plastic material foil to each other, and a second adhesive adhering said electric conductors to said plastic material foils; said second adhesive being stronger than said first adhesive; whereby, upon tearing of said layers of plastic material foils apart, said conductors will be broken.
  • a timing circuit operatively associated with said device and with said last named means and set to activate said last named means to at least substantially modify the contents of said safety box in a lasting manner, at a rate sufficient to effect such modification before an unauthorized intrusion into said safety box can be completely effected.

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  • Burglar Alarm Systems (AREA)
US00228867A 1971-02-23 1972-02-24 Safety box or the like Expired - Lifetime US3851602A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT152271A AT315019B (de) 1971-02-23 1971-02-23 Sicherheitsbehälter od.dgl.

Publications (1)

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US3851602A true US3851602A (en) 1974-12-03

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US00228867A Expired - Lifetime US3851602A (en) 1971-02-23 1972-02-24 Safety box or the like

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US (1) US3851602A (de)
AT (1) AT315019B (de)
CH (1) CH551322A (de)
FR (1) FR2127738A5 (de)
GB (1) GB1375926A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573043A (en) * 1983-06-20 1986-02-25 Captor Holding B.V. Safe guarded lockable container, particularly for transporting money and securities
WO1988001003A1 (fr) * 1986-08-06 1988-02-11 Svenska Arkivator, Ab Conteneur de securite
DE3704113A1 (de) * 1987-02-11 1988-08-25 Burkhard Panier Sicherheitsbehaelter fuer flache datentraeger, insbesondere scheckkarten
US4865283A (en) * 1987-04-03 1989-09-12 Parker Robert J Merchandising display stand
DE3915068C1 (en) * 1989-05-09 1990-08-09 Thomas 7316 Koengen De Matouschek Safe with alarm and monitor - has narrow lead(s) broken by rod-shaped locking elements in retention region if forced open
US5027397A (en) * 1989-09-12 1991-06-25 International Business Machines Corporation Data protection by detection of intrusion into electronic assemblies
US5072211A (en) * 1990-07-03 1991-12-10 Clement Roger B Safe alarm system
JPH05201483A (ja) * 1991-06-21 1993-08-10 Wl Gore & Assoc Uk Ltd 改良形保安用エンクロージャ
WO1999061741A1 (en) * 1998-05-22 1999-12-02 Sqs Security Qube System Ab Method and device for marking of objects
WO2002006616A1 (en) * 2000-06-29 2002-01-24 Kjell Birkeland Wall construction for storage of valuables
FR2814928A1 (fr) * 2000-10-09 2002-04-12 Kallia Dispositif de protection des deverrouilleurs d'articles dans les magasins
FR2827001A1 (fr) * 2001-07-03 2003-01-10 Brinks France Dispositif de securite pour le transport et/ou le stockage de valeurs papier
FR2846361A1 (fr) * 2002-10-29 2004-04-30 Brinks France Dispositif de securite pour le transport et/ou le stockage de valeurs papier
US20050139132A1 (en) * 2002-02-06 2005-06-30 Kjell Linkskog Method and device related to a container
US20060230994A1 (en) * 2004-10-04 2006-10-19 Philippe Besnard Security device for the transportation and/or storage of assets, in particular based on paper
US20080036598A1 (en) * 2006-06-09 2008-02-14 International Business Machines Corporation Tamper-proof structures for protectig electronic modules
US20180279456A1 (en) * 2015-09-22 2018-09-27 Tarcísio Caddah Melo System and method for two-level protection for accessing closed and semi-closed enclosures
US20180374324A1 (en) * 2015-12-16 2018-12-27 Catamoeda Pesquisa e Desenvolvimento de Máquinas S.A. Capacitive Tamper Detection System For Smart Safe or Automated Teller Machine

Families Citing this family (22)

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Publication number Priority date Publication date Assignee Title
SE405754B (sv) * 1977-03-01 1978-12-27 Ericsson Telefon Ab L M For verdehandlingar avsedd berbar anordning
ZA806649B (en) * 1979-10-31 1981-10-28 D Richards Cash safe
IL64015A (en) * 1980-10-24 1984-10-31 Pretini Gisberto Automated bank counter
DK147325C (da) * 1982-02-18 1984-12-10 Eddie Lai Stenild Apparat til spredning af farvestof over vaerdipapirer i et lukket rum ved forsoeg paa tyveri
EP0108050A1 (de) * 1982-05-04 1984-05-16 CEDERGREN, Stig Verfahren zum färben von dokumenten bei versuchtem diebstahl und verfahren zur durchführung dieses verfahrens
ES533153A0 (es) * 1984-05-24 1985-10-16 Olivares Albacete Manuel Perfeccionamientos en los sistemas de inutilizacion de billetes de banco en caso de robo
GB2211645A (en) * 1987-04-27 1989-07-05 Wu Shuenn Shing Storage container for valuables
GB8814471D0 (en) * 1988-06-17 1988-07-20 Gore & Ass Security enclosure
BE1002842A6 (nl) * 1989-02-16 1991-06-25 Bitcom Europ Nv Elektronisch beveiligde houder voor waardepapieren.
FR2674897A1 (fr) * 1991-04-02 1992-10-09 Segourgeon Maurice Dispositif de protection contre le vol de fonds ou de valeurs.
GB9113455D0 (en) * 1991-06-21 1991-08-07 Gore W L & Ass Uk Improvements in security enclosures
GB9113436D0 (en) * 1991-06-21 1991-08-07 Gore W L & Ass Uk Improvements in security enclosures
GB9115641D0 (en) * 1991-07-19 1991-09-04 Gore W L & Ass Uk Protective sheath
GB2264378A (en) * 1992-02-11 1993-08-25 Transalarm Ltd A frangible sensor for a secure enclosure
US6215397B1 (en) 1996-08-13 2001-04-10 Lindskog Innovation Ab Electrical manually portable security case for the storage of theft attractive articles with an electrical mat having at least one elongated electrically conductive wire in a substantially continuous mesh, loop or eye structure
US5481428A (en) * 1992-06-18 1996-01-02 Martin Marietta Energy Systems, Inc. Process for manufacturing multilayer capacitors
GB2270785B (en) * 1992-09-22 1996-05-08 Gore & Ass Improvements in security enclosure manufacture
GB2306034A (en) * 1995-08-10 1997-04-23 Jignesh Amin Alarm device for a container
GB2319377A (en) * 1996-11-07 1998-05-20 Brendan Roberts Security detection film
BE1012485A5 (nl) * 1998-07-09 2001-01-09 Clercq Jean De Inrichting ter beveiliging van een toeganggevend element.
UA107206C2 (uk) * 2009-12-08 2014-12-10 Багатокомпонентна система офарблення для захисту цінностей
GB201719396D0 (en) * 2017-11-22 2018-01-03 Walsh Timothy Neville Tamper detection system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US126289A (en) * 1872-04-30 Improvement in electrical linings for safes, vaults
US181078A (en) * 1876-08-15 Improvement in electric burglar-alarms
US483728A (en) * 1892-10-04 stromberg
AT95683B (de) * 1920-01-23 1924-07-10 Anton Weger Wertbehälter mit Alarmvorrichtung.
US1686457A (en) * 1926-10-26 1928-10-02 Thaddeus S Mcclintock Burglar alarm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US126289A (en) * 1872-04-30 Improvement in electrical linings for safes, vaults
US181078A (en) * 1876-08-15 Improvement in electric burglar-alarms
US483728A (en) * 1892-10-04 stromberg
AT95683B (de) * 1920-01-23 1924-07-10 Anton Weger Wertbehälter mit Alarmvorrichtung.
US1686457A (en) * 1926-10-26 1928-10-02 Thaddeus S Mcclintock Burglar alarm

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4573043A (en) * 1983-06-20 1986-02-25 Captor Holding B.V. Safe guarded lockable container, particularly for transporting money and securities
WO1988001003A1 (fr) * 1986-08-06 1988-02-11 Svenska Arkivator, Ab Conteneur de securite
EP0255885A1 (de) * 1986-08-06 1988-02-17 Arkivator AB Sicherheitsbehälter
US4852502A (en) * 1986-08-06 1989-08-01 Sven Klingberg Safety box for safeguarding documents and the like
DE3704113A1 (de) * 1987-02-11 1988-08-25 Burkhard Panier Sicherheitsbehaelter fuer flache datentraeger, insbesondere scheckkarten
US4865283A (en) * 1987-04-03 1989-09-12 Parker Robert J Merchandising display stand
DE3915068C1 (en) * 1989-05-09 1990-08-09 Thomas 7316 Koengen De Matouschek Safe with alarm and monitor - has narrow lead(s) broken by rod-shaped locking elements in retention region if forced open
US5159629A (en) * 1989-09-12 1992-10-27 International Business Machines Corp. Data protection by detection of intrusion into electronic assemblies
US5027397A (en) * 1989-09-12 1991-06-25 International Business Machines Corporation Data protection by detection of intrusion into electronic assemblies
US5072211A (en) * 1990-07-03 1991-12-10 Clement Roger B Safe alarm system
JPH05201483A (ja) * 1991-06-21 1993-08-10 Wl Gore & Assoc Uk Ltd 改良形保安用エンクロージャ
JP3366666B2 (ja) 1991-06-21 2003-01-14 ダブリュ．エル．ゴア アンド アソシエイツ（ユーケイ），リミティド 改良形保安用エンクロージャ
WO1999061741A1 (en) * 1998-05-22 1999-12-02 Sqs Security Qube System Ab Method and device for marking of objects
US6564726B1 (en) 1998-05-22 2003-05-20 Sqs Security Qube System Ab Method and device for marking of objects
WO2002006616A1 (en) * 2000-06-29 2002-01-24 Kjell Birkeland Wall construction for storage of valuables
FR2814928A1 (fr) * 2000-10-09 2002-04-12 Kallia Dispositif de protection des deverrouilleurs d'articles dans les magasins
WO2003004818A1 (fr) * 2001-07-03 2003-01-16 Brink's France Dispositif de securite pour le transport et/ou le stockage de valeurs papier
US20040216651A1 (en) * 2001-07-03 2004-11-04 Philippe Besnard Security device for transporting and/or storing paper items of value
US7121215B2 (en) 2001-07-03 2006-10-17 Brink's France Security device for transporting and/or storing paper items of value
FR2827001A1 (fr) * 2001-07-03 2003-01-10 Brinks France Dispositif de securite pour le transport et/ou le stockage de valeurs papier
RU2338860C2 (ru) * 2002-02-06 2008-11-20 ЭСКЬЮЭС Секьюрити Кьюб Систем ЭйБи Способ и устройство, относящиеся к контейнеру
US20050139132A1 (en) * 2002-02-06 2005-06-30 Kjell Linkskog Method and device related to a container
US7628112B2 (en) * 2002-02-06 2009-12-08 Sqs Security Qube System Ab Method and device related to a container
FR2846361A1 (fr) * 2002-10-29 2004-04-30 Brinks France Dispositif de securite pour le transport et/ou le stockage de valeurs papier
EP1416112A3 (de) * 2002-10-29 2004-08-04 Brink's France Sicherheitsvorrichtung zum Transportieren und/oder Lagern von Wertpapieren
US20060230994A1 (en) * 2004-10-04 2006-10-19 Philippe Besnard Security device for the transportation and/or storage of assets, in particular based on paper
US7533801B2 (en) * 2004-10-04 2009-05-19 Brink's France Security device for the transportation and/or storage of printed assets
US20080036598A1 (en) * 2006-06-09 2008-02-14 International Business Machines Corporation Tamper-proof structures for protectig electronic modules
US7915540B2 (en) * 2006-06-09 2011-03-29 International Business Machines Corporation Tamper-proof structures for protecting electronic modules
US20180279456A1 (en) * 2015-09-22 2018-09-27 Tarcísio Caddah Melo System and method for two-level protection for accessing closed and semi-closed enclosures
US11013095B2 (en) * 2015-09-22 2021-05-18 Tarcisio Caddah Melo System and method for two-level protection for accessing closed and semi-closed enclosures
US20180374324A1 (en) * 2015-12-16 2018-12-27 Catamoeda Pesquisa e Desenvolvimento de Máquinas S.A. Capacitive Tamper Detection System For Smart Safe or Automated Teller Machine

Also Published As

Publication number Publication date
GB1375926A (en) 1974-12-04
DE2202930B2 (de) 1975-08-21
FR2127738A5 (de) 1972-10-13
DE2202930A1 (de) 1972-08-31
AT315019B (de) 1974-05-10
CH551322A (de) 1974-07-15

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