CA2195535A1 - Bell system and/or multiple door intercom system - Google Patents

Bell system and/or multiple door intercom system

Info

Publication number
CA2195535A1
CA2195535A1 CA002195535A CA2195535A CA2195535A1 CA 2195535 A1 CA2195535 A1 CA 2195535A1 CA 002195535 A CA002195535 A CA 002195535A CA 2195535 A CA2195535 A CA 2195535A CA 2195535 A1 CA2195535 A1 CA 2195535A1
Authority
CA
Canada
Prior art keywords
telephone
door
bell
accordance
tho
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.)
Abandoned
Application number
CA002195535A
Other languages
French (fr)
Inventor
Manfred Trautvetter
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2195535A1 publication Critical patent/CA2195535A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
    • H04M11/025Door telephones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M11/00Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/02Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Types And Forms Of Lifts (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephone Function (AREA)
  • Alarm Systems (AREA)

Abstract

It is the aim of the invention to provide a door intercom and bell system making it possible to provide additional functions besides the bell and largely avoid additional wiring. This aim is achieved in that the keypad and the call system in the dwelling are connected via a bus system to a microcontroller and electronically controlled indicators are fitted as identification plates. The invention relates to a door intercom and bell system with a keypad having at least one identification plate.

Description

2 t ~
.

Bell Syste~ ~nd~or Multiple ~oor ~P~ r- Systom The invention relater to a door telephone and bell eystem with nn array of keys which 1~ provided with at lea~t one ;~ntif i ~ on sign.
Many designs of bell and ~ultiple door telephone ~ystemo _re known to the Btate of the art ~hich have ' layout of individual functional elements nuch as n~me platss~ bell key~, door iht~ ~' ~nd ~
rt le Al80 knuwn from DE 83 55 428 Ul for the keys to be provided with lightn. F~L;' , an aLI _ ~ 18 ~ ln DE 81 07 819 Ul in whieh an A; ' -' ~ell is provldsd wlth a control device whlch ~ake8 it ~ ; h~ e to di~fer, iAte whether the bell has been rung outside the house door or outside the ap~ i l door. This i~ _chieved by the oell havlng two ringing device~ with different Acoustic signal~ which are integrated in a co~on phase which al~o cont~ins tho internal control dlodes, while the oxternAl dloder are - l ~ tn of the apart~nt bell.
~ he disadvantAge in tho arrAr 'r known to the state of th~ A-rt i8 that they are only ~uitable for _ relatively R~ll nurber of ap~rt~nts becaure they either 2 ~ ~5 ~ -only m~ke pos~ible one connection of the ~ell with an ~prLi or in the c~se of the - - ~jon of A p]l-~al ;ty Of ~part~onts with each other they require ve~y high expenditure on cahling and ~ni~-l part~. Apart from which, in thl~ case tho c~ble~ mu~t bo indlvldually 1 in e~ch ,- ~ t.
The ~ r print~d p4tent docu~ent XP-A-O 03Z g82 descrlbo~ a house nystem for the transmlbnion of 1nr~ , h~ving a plurality of ~ntorc L~d branch ~t~tione and nn eloctrical current ~upply~ wherein an e~senti~lly identically aonutructed, highly integrated clrcult is provlded ~t oach br~nch ~tntion, where the desired indivldual function blocka are ~ ~ Led to uaid circuit. Thefe hlghly int~gr~d clncuit8 are in c ~ 'i~
with each other by ~H~n~ of one ~lngle i ~ ~edium through nn l.-t _ Ll~ o~ coupllng element~.
- Further t~leE' - ~ystem~ nre know~ to the ~tnte of - the nrt ln which ~ n tf of n door ~ - Ry~tu~ ar~
~ inn~ to the ~1 1 8y8ttm.
Wherehy the t~l~ - i8 . - Lrd to tbo tol~,' syntem by n ~p-ci~l ~ 'i 3 secket which 18 connected both to the puhlic telephone network as woll ~ to the door toln~h uy-t~. Control of the door trl~,' ~ uyst~m iu 21 9553'~

mad~ p- ~ihle by additlonal cahling betwoen the t~ mn~
and tho ny~tem.
Further t~eF~ nQ ny~tem~ ~re known in which the door tql~rh~n~ statiOn is ~ '~d via a two-wlr~ ; n~rf r -to th8 t~lorhnn~ sy~te~.
The di~dvantage of the known nL ~ that ~l- t~ 1 c~bling i8 rDqrlre~ between the t~l~r~n~ nnd the gystem.
The ob~ect of the pressnt lnv~ntlon is to crcate a door t~ r and bQll nyntem which makss lt EC ~hlc to ~rrango additlonal sxtra functionn ~ Aq the bsll and thereby suhstAntially avoid add~tional expenditure on cabling and ~hich make~ a continual updating E ~;hl~ in a ~i~plo vay.
According to the present inventlon, the obj~ct 18 a4hieved ln that olectronically controlled display~ are provided aB identification slgns and that elsctronically controlled display~ of a lett~r-box siqn are ~nr ~A to the ~y~tem.
rurther ~dvantageou~ ~ -' 'i rlta of the invention arQ given in claims 1 to 9.
Whureby it 1B~ for examplc, poRsible that an eluctronlcally controlled dinplay i~ provided a~ an 2 1 q5~3~
.

~-3 n~;f~r~;rn ~ign and~or th~t thc i- 1 fic~ln~ signs are connectod vi~ a bun ~ystem to microcontrollers~ The c 3~n can ~lno be made without a bus syHtem.
LCD diaplays, LED dLsplays, fl rcr displays can be used for tha electronic diuplay or oven dinplays bssod on ~-n;rnl or ~$c~v - 1c~1 wor~ing rr3~~1ple~
The connection between tho c --'; , stQtlon~ c~n, for exorple, be ~ade vla a ~ix-cor~d aablo.
In addition, it in pos~i~le for additional ~el ,' statlons to be _ q t 1 to the sy~tem.
Th~ uy~tem ~ccording to the present invention distinguishen itself by a high degree of operat~onal r~ lity and high ~tability ovor lengthy periods of time ~ n consequence of the ~mall number of mechQnical connoctiny points.
A further su~nt~ntlal adva~t~ge of the syste~
~ '-J to the present invention ari~e~ from the fact thnt the co~tly manual l~belli~~ of bell nnd l~t~ -bo~ plates otherwise roquirr4d, ~specially in re~idential highri~e I ~lr3~ can b~ p - ' ~lo_t~ ir~-lly. ~hereby, whon thern is ~ chango in th~ r of an ~ , ~ simpl~
e,_ ing can b-3 p L~ ~ which ~ lly en~uros th4t the signs h~vR a unifonm pattorn.

2l 95535 ~

Where_y it i~ advantngeous for the elcctronic displny to be ~ d wlth two linen.
Fur~ e, it is L ~ ;~le for n letter-box sign provided with an electronic displar to be ndditlonally ~~ ~ L~l to the bell uystem, this in~ Lad via the same bus.
An adv~ntrJL~us ~ rt of the bell ~y~tem in nccordanaa with the present invent$on provides ~or 'ilti~ l ~en~or~ to be nttached to the bell ~ystem.
The syutem accordlng to the present lnvention ~ LI~L~ a ~erles of ~d~ - ~ F in _ r~ to device~
known to the Dtate of the art.
Wlth thl~ ~ystem any number of p~rties cnn be connected to a ~ingle sy~tum wlthout great ---c~onicnl requirementu. Tho ~ystem i~ especially suitahle for h1 rJhrir ~ } i lr~
The c-_ n ~ catlon ~ystem is capable of uelf-monitoring and slgnalling the appropri~te f~ults.
Furt' , lt i8 1 ~ hl e to teUt the entLre ~ ~ D Le~
from ~ centrnE position without h~ving to enter any _ i L~. Another $mportant advantnge of the i~.. -10~ is that ~ ~urlen of ~tra functlons cAn _e l-'-_ ~I vithout Any dif~iculty. For exa~ple, it i8 los-ihlR to include 2 ~ 9553~
.

~unsorn for detecting d~mpneh~, fire, theft, a key for mediaal ~-..cle~ and signal~ for the hard of heAring ~e.g. fln~hir~ ~ignal~ ~nd vi~ual dl~plays~ in the ~ygtem.
With the bu~ sy~tem in r : '-n~ with tho pre~ent invention it i~ p ihl~ to connect each connection with ~uut one uix-cored c~ble. Whereby it is - ~:r ~11y AdvantAgoous that the ~y~tom cAn be ~ lrred with a ponltive rocoiver ~ ~n for i-~c ~ n ln cnno of fire. ~ith thi~ lt i~ r-. ~h~e to control ths flow of psoplQ by ~endlng lnfor~-t~o" to individunl floor~. Thi~ ti~ can b~ glven from A
r~ le l~et~n which is - ~e ihl~ in caae of flre, for ~xample tho ~-re~ r~s room on the ground floor.
r itlon~l Advnnt ~; ' 'i ' n of the hyst~n ~ to the prehent invention provide for the exi~ting telophone in the apsrtment to be connected to a hou~e-tol ~ - connection unit, for whicb there i~ a ' , _ ~wltch in the housn-~ p ~ ~ e il unlt whlch ~ .r~
the t~ to the public tAl~E~ network ln the defAult /po~ition An~ with the door t~l _ ~c ~y~te~ in the working po~ltion ~nd whereby tho change-over ~witch can be controllad from the door ~ ' ~ statlon and/or from the tel~
An advAntagoou~ t of the door 3yutem 2 t ~3;5 .

n~~or~;n~ to the pr-osent inventlon nri~en from the f~ct th~t the hou-e-t~l ophnn~ conn_ction unlt comprise~ ~ swltching to rerag"i7s key Actlvations, a call ~t~ .t:r ~nd ~n ~v_ '-ting circuit for oo~noctlng ~ign~la with whLch th~ tol ~h i~ controlled.
It is particularly ~dvantag-oous th~t commercially avnllabln telophone d-ovices can be u~d a~t tel~}'~
~heroby ~t~nd4rd ~-b-t-l p~ ~, rSDN-~ole,~
~ or v~ - G~n bs u~cd. It i~ al~o E . h~ o to u~o an r - . ~ , machine in~tcnd of ~ te,l ,' . It 1~
~ddition~lly advantayoous tbat no ~dditlon~l key~ ~re required on the t~l~phon~. In the uyst~m ~ to the pr~sont invention, th_ tnlcphone device of the door t~olnp~ - ~an ea~lly be d ~ nod in the tol~ ~' ~ ~ tWo-WtrQ
tP hl ~ql~~. In ~it~n it is ndvant~geous th4t the door t~ system can be c~ v; ' to the telephone ~imply llke a ~t~ndArd phone lln_ termin~l - th4t i~, for _~nmpi~, likQ A ~odem or fnx m~chine - via th_ phon_ lin~ ~ocket inBt~llnd in the ~ -t '.
In known door t~lR,' . ~y~tem~ the ;n~ of the t-leEb ln n door t~l~,' - system is only E --;hlc vla A
_ 1 e~ 1 ol t,~ ~ syst~om in~tallod in th_ houso. Tho door E' ~ ~y8tem is conn~cted a~ an ~'tl, -1 . t to a ~ F system. Wherebr the t~l~E'- i~ c~ vi~
a ,--~f;r~ connecting ~ocket to the tol~ y8te~. The to}~pb - ~yst~m i~ i to tho telecom cnnnecti~n a~
wcll a8 to the door ~D~ sy~t~m~ ~he t ~ io~ of control signal~ ta the door telephone By8tQm i8 made __ihl~ by means of ~ t~or-lly provided ¢Abling betw~n tho telopb - ~nd the tnl~phone eyetem. Buch control ~ign~lo can, for exa~pls, c~u~e the door to be op~ned.
In the ca-~ of the daor tal~p' e sy8tem ~
to the pre~snt i~vQntlon ~ non~al ~ r~n~ i~ u~sd a~ the houoe tel~phone ior the door telephonQ syut~m. The t~ e i8 . - Lcd via ~lut~ndard phone line Rocket to ths t~leco~ ~ i: . The conpling i~ mads p ; hle by the telarho~a belng ~ -~Led via A ,'--ge~ r switch to the t~locom connection. This nh-nqe o~er swltch is a _ n ! L of ~ honLe-tal ~ - connection unit. When th~
ge o.~ ~witch iR in tho dsf~ult p ~'tion th tel~
~1~ connncted to the t~leco~ sonnection. When the ¢hangs-ovRr ~witch in in the worklng p~~ition th~ taleFb q is A{. I ~:t~ from the telecom connection and controlled by the door tol~pbnnP system. ~ith~r ths hous~-t~lophc~~
conns~tion unit or the door tel~ y~tsm iu sguipped with A ~gcial circuit for controlling thn ~ygt~, which _ g _ 2 1 ~5$~5 .

make~ E~ le the recognition of koy a~tivatlone on tho telephone, with which certain funotions of the door tel~ h - ~ystem, for exDmplc, ~open door~, ~switch on door t~l er~ ~ st~tion~ ~nd ~uch liko c~n be controlled. In Addltion, the hou-e-te~Qp~ ~ connoction unit or thc door ~nl~' - Oy8tem hnR ~ o~ t , whlrh can be used, to mnko tho t~ ~ ring, and vi~ sn t ~ ti-~ circuit for connectlng voice ~mong~t other signals with which the t~1 ,' ~ c~n bc controlled. The ~ ~ _Y ~witch, which i4 ' ----,.l~ ln the house-tql~rh~na connoction unit, con~i~t~
of A rel~y which is eithex ~ d by the door tq~ 9 Oystem or by the ~el~r~. -It ~ A 81~o posslble for tha tclephone to ber P Led vi~ ~ bus ~yntem to tho door statlon. The bue ~y~tam cnn be d -t~ ~8 8 two-wire system. To pravent unwnntod ~ross-connectionn betwoen the intividu~l telsp~ e, the t~lepb~.~- 4ra connocted in A ~1-~ 'Ally n-~ circuit via a -owitch to the bus O~ystff~.
A furth~r : i~- L of the door fel ~ sy~tem a~ to the present in~. ton provide~ for the door ~t~tion to be c - Led to ~ publio 1~ notwork vi~ 4 connectlon unit, for ex ple ~ voica ~i- . The t~lr lnstnlled ~n the ~ re thon controll~d 2 1 9553:~
.

via this public - ~en~; network. Wher~by it i8 nlso ~r ;hls ~o provlte for Cdl fv ~
Thn invention i~ ~YplAined in more dotall below by menn_ of exumplifying ~ -~i ntu. The _r_ _~nying drawing~ shv-u~
figure 1 a uy~te~ comprising a key~ bell And bu~-~tem, figure ~ n ~ystum oomprising _ key, bell~ a vller nnd L ~ L~_, flgure 3 a 0ystom ~n which the key and~or the bell arrJ L ' ViA ~'~ er to the ~un sy8t~m, figure 4 the nnme ~lnte~ ncoordinq to the present i~ t~o with ~n al~ rAlly ~ displ_y, figurn 5 a ~y~tem with sensors ~
figur. 6 _ ~yntem with a eard render ~ _t d, figure 7 a system with a door openlng ~ystem figure 8 a ~yst~c wlth a door tAle~ device _nd internnl ~ol- ~ ~tntions~
figurn 9 _ ~y~t~ wlth ~ ~r~, figure 10 a ~ystem which is oonnectnd to thu ~1. nntwork.
Pigure 1 show~ the b_~io varinnt of tho bell sy~tem 2 ~ 95535 '~g to the pre~Qnt in~ention. ~hereby bell key 3 ~nd bell 4 aro connected to the bu~ 1. Bell key 3 and bell 4 are theroby aonnected to the bn8 1 via a connecting ~lr ~ 1c element 2. In certain caees it ie also useful to carry out e4tries ~y r~ote control.
In the ~ t d~R;; 7 as shown in figure ~ a er 5 is -'' tic - l l y - ' ' to the bus.
Another p~ ihlq ' '; ~r ig ~bown in flgure 3.
In whlch oach of the c~n~rnll;r~ elL_L-~r~C Qle ~- n whicb connnct the bell key 3 and the boll 4 with tho bu- 1 is .n' ~ r~ r 5 .
Figure 4 ~hows a de~ign for an t~Dnf1flr~tlnn sign.
Tho 1~ '~ f;~rf i~ ~ign i~ A n~e pl~te in this ca~e ant consi~tn of an electronically controlled di~pl~y. ~he electronically controlled di~play 1~ connected to the ~ ~ ;~3 el~_t_ i~ ele~ent 2 by conn-~t~ng cAbl-s 6.
Figur~ 5 ~how~ an ~ fying ~ ' ~; L o~ the ~ystem according to the pressnt il.~Q -;on with sensor~ 8 - ' 1. Whereby it ie r ~ ~ hl~ to include in the system v~riou~ son~or~ 8 for detecting ~ sitn~t~ ffuch a8 flre, wnter d~age and such like. The entry of the nnIeu in the ~t ' ;~ ~igns can bo carried out wit~ tho help o~ a ~peclal koyboard or wlth a per_ -1 computQr. Further ~ 55~5 .

p i hl ~ n~i~n~ Of the uy~t~ are uhown in figures C and 7. Ths system can b- ~Yp~nr7~d with, for exampls, card rsadors 15 or with door openerU 9 . With which it is aluo p i~l~ to includo closing f~ ti. in the ~ysten.
Pigure 8 uhowu an '; of th~ syetQm in whlch a telnphone ~ystem haR bo~n integratod. Por this door t~l~E~ ~ st~ti~ - lO ars providsd at the nntry doors and ~nto-~rl t~l~p' ~e stati~nu ll ln the apartments, cellars and other lo~a~i r. in the hou~e. This ~akeo it r: 'hl~ to oper4to n c f- ~ bell aystem and door tel~ system.
Control is carried out via the bu~ l.
In the . '~d~- t shown in flqure ~ one or plurAlity of lu ~ ru 12 ar~ 7-J-~ in the uyutom.
~his ~akes it po~ible to use the uy~te~ to transmit in-L~ in the k i7~i~g or in individuAl parts of tho buildlng uuch ~8 ap~rtment~, cell~r nnd ~uchlike ]y fro~ the actions of th~ cr~1~-- - in case of dl- -L~.
~ iqure lO ~how~7 an -~71 ~, in which the bell sy-tem accordinq to the pre~ent invention is : - L~ to the te1~ lL ~ network 14. The bell ~y~tem can th~reby bs connect-d via the bus l directly with tho help of a connecting unlt 13 ox indirectly via further suit~bl~

2 1 95~3~

ffy~tem~, not ahown here, to the te~ F network. The t~ sy~tem can b~ u~ed, for ox~mple, to chnnge tho aloctronlc ~igns. ~hi~ mnke~ poaaible both the ~ irg of the nnma~ ln tho systom ~nd the ~imple perfor~nnce of ~ tA - work. It i~ alao r - i hle to connect tho b~ll ay~tem to tha tel r Lhr - notwork 1~ without a bu~. When u~lng thR sy~tem n~ an alar~ system, a~cumulated ~ np~ cnn bo t '~ to the v 1~ in ca~e of disa~ter by t~ - or cordleff~.

.

. LIST 0~ n~ SIG~S

1 ~U8 2 ~ ctronic~
3 ~ key ~ B~ll 5 ~i ~a~ r 6 ~-~ i 3 cnbl~s 7 Display ~wdule 3 8en-or 9 Door opnner 10 Door te~ tation 11 Interior tole~ ~ 8tAtion 12 ~
13 C ~1 unit 14 ~ networ~
15 Card roader

Claims (6)

1. Door telephone and bell system with an array of keys which is provided with at least one identification sign, wherein the array of keys and a calling device in an apartment are connected to a microcontroller via a bus system, characterized in that electronically controlled displays (7) are provided as identification signs, and that electronically controlled displays (7) of a letter-box sign are connected to the system.
2. System in accordance with claim 1, characterized in that the electronic display (7) is designed with two lines.
3. System in accordance with claim 1 or 2, characterized in that a common electronic display (7) is arranged for a plurality of identification signs.
4. System in accordance with one of the claims 1 to 3, characterized in that loudspeakers (12) are arranged in the house which are connected via connecting units to the door telephone device.
5. System in accordance with one of the claims 1 to 4, characterized in that thesystem has at least one telephone connected to a public telephone network (14), whereby the existing telephone in the apartment is connected to a house-telephone connection unit, in which there is a change-over switch, which in one position connects the telephone to the public telephone network (14) and in the other position connects it to the door telephone system and whereby the change-over switch can be controlled from the door telephone station and/or from the telephone.
6. System in accordance with one of the claims 1 to 5, in which the house-telephone connection unit comprises a switching arrangement to recognize key activations, a call generator and an accommodating circuit for connecting signals which control the telephone.
CA002195535A 1994-07-18 1995-04-28 Bell system and/or multiple door intercom system Abandoned CA2195535A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEP4425309.5 1994-07-18
DE4425309A DE4425309A1 (en) 1994-07-18 1994-07-18 Door intercom
PCT/DE1995/000553 WO1996002998A1 (en) 1994-07-18 1995-04-28 Bell system and/or multiple door intercom system

Publications (1)

Publication Number Publication Date
CA2195535A1 true CA2195535A1 (en) 1996-02-01

Family

ID=6523448

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002195535A Abandoned CA2195535A1 (en) 1994-07-18 1995-04-28 Bell system and/or multiple door intercom system

Country Status (14)

Country Link
EP (1) EP0771502B1 (en)
JP (1) JPH10505717A (en)
KR (1) KR970705279A (en)
CN (1) CN1157680A (en)
AT (1) ATE194740T1 (en)
AU (1) AU691280B2 (en)
BR (1) BR9508324A (en)
CA (1) CA2195535A1 (en)
CZ (1) CZ16497A3 (en)
DE (2) DE4425309A1 (en)
HU (1) HUT77233A (en)
NO (1) NO970213L (en)
PL (1) PL318314A1 (en)
WO (1) WO1996002998A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19628764A1 (en) * 1996-07-17 1998-01-22 Deutsche Telephonwerk Kabel Entry phone system in combination with telephone and door opening
DE20002331U1 (en) 2000-02-10 2000-05-04 Siemens AG, 80333 München Wireless house communication system with door station
CN106097495A (en) * 2016-06-03 2016-11-09 赵树龙 A kind of intelligent voice control vocal print face authentication door access control system and method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2946177C2 (en) * 1979-11-15 1988-08-18 S. Siedle & Söhne Telefon- und Telegrafenwerke GmbH, 7743 Furtwangen House system for the transmission of information
WO1988002968A1 (en) * 1986-10-08 1988-04-21 Clifford Jack Peady Telephone system with door intercom station
DE4204517C2 (en) * 1991-06-25 1994-02-24 Rutenbeck Wilhelm Gmbh & Co Microprocessor controlled telecommunication device
DE4127316C1 (en) * 1991-08-17 1992-06-25 Telenorma Gmbh, 6000 Frankfurt, De Process for automatically making telephone connection from door intercom via telephone - by closing activating switch, leads from door bell contact can be connected to contact point of target button of telephone
FR2687298A1 (en) * 1992-02-19 1993-08-20 Boniface Andre System for indicating that an object has been placed in a closed chamber such as a letterbox, and chamber, such as a letterbox, equipped with such a system
FR2693759B1 (en) * 1992-07-17 1994-10-14 Philippe Aubin Security access door device, particularly suitable for access to a building.
DE4236565C2 (en) * 1992-10-29 1997-01-30 Deutsche Telekom Ag Door intercom

Also Published As

Publication number Publication date
NO970213L (en) 1997-03-04
CZ16497A3 (en) 1997-06-11
JPH10505717A (en) 1998-06-02
BR9508324A (en) 1998-01-06
PL318314A1 (en) 1997-06-09
NO970213D0 (en) 1997-01-17
KR970705279A (en) 1997-09-06
CN1157680A (en) 1997-08-20
ATE194740T1 (en) 2000-07-15
DE59508570D1 (en) 2000-08-17
WO1996002998A1 (en) 1996-02-01
EP0771502B1 (en) 2000-07-12
EP0771502A1 (en) 1997-05-07
AU691280B2 (en) 1998-05-14
HUT77233A (en) 1998-03-02
AU2302795A (en) 1996-02-16
DE4425309A1 (en) 1996-01-25

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