US3873213A - Method and apparatus for detecting data on a photographic recording medium - Google Patents

Method and apparatus for detecting data on a photographic recording medium Download PDF

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Publication number
US3873213A
US3873213A US459197A US45919774A US3873213A US 3873213 A US3873213 A US 3873213A US 459197 A US459197 A US 459197A US 45919774 A US45919774 A US 45919774A US 3873213 A US3873213 A US 3873213A
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United States
Prior art keywords
frame
light
signal
predetermined position
reflected
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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US459197A
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English (en)
Inventor
John David Plumadorf
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.)
Kimberly Clark Tissue Co
Original Assignee
Scott Paper Co
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 Scott Paper Co filed Critical Scott Paper Co
Priority to US459197A priority Critical patent/US3873213A/en
Application granted granted Critical
Publication of US3873213A publication Critical patent/US3873213A/en
Priority to GB14210/75A priority patent/GB1510532A/en
Priority to BE1006578A priority patent/BE827656A/xx
Priority to CA223,993A priority patent/CA1044304A/en
Priority to DE19752515327 priority patent/DE2515327A1/de
Priority to FR7510976A priority patent/FR2266907B1/fr
Priority to JP50041908A priority patent/JPS5817954B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
    • G03B27/583—Handling microfiche
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/46—Projection printing apparatus, e.g. enlarger, copying camera for automatic sequential copying of different originals, e.g. enlargers, roll film printers
    • G03B27/47—Projection printing apparatus, e.g. enlarger, copying camera for automatic sequential copying of different originals, e.g. enlargers, roll film printers at different positions of the same sheet, e.g. microfiche
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/221—Machines other than electrographic copiers, e.g. electrophotographic cameras, electrostatic typewriters
    • G03G15/223—Machines for handling microimages, e.g. microfilm copiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection

Definitions

  • ABSTRACT Wibert Assistant Examiner-Richard A. Rosenberger Attorney, Agent, or FirmR. Duke Vickrey; William .1. Foley [57] ABSTRACT Disclosed is a method and apparatus for detecting data recorded at a predetermined position on a photographic recording medium.
  • the apparatus includes signal-light projection means for projecting light to the predetermined position on the photographic recording medium and signal-light detection means positioned to receive and detect the intensity of the signal light leaving the photographic recording medium. The magnitude of the signal light leaving the photographic recording medium is affected by the data recorded at the predetermined position.
  • the apparatus is an exposed-frame detector for detecting whether a particular frame on a photographic recording medium having a plurality of discrete frames has been exposed.
  • the apparatus includes mask means for producing a black border on each frame, the black border being opaque and refleeting the signal light at a reduced predetermined intensity.
  • the signal-light detection means measures the reduced intensity of signal light and can inform the operator, though conventional electric circuitry, that the particular frame has already been imaged.
  • the present invention relates generally to systems for photographically storing data, and more particularly, to an apparatus for detecting data recorded at a predetermined position on a electrophotographic film.
  • microphotographic copying system which records data from documents upon discrete frames of a multi-frame microfiche
  • This type of microfiche is a transparent elec trophotographic film having a substrate of transparent material, such as five mil polyester base, with a thin transparent conductive layer coated thereon as well as an additional outer layer of a suitable transparent photoconductive material.
  • a transparent elec trophotographic film having a substrate of transparent material, such as five mil polyester base, with a thin transparent conductive layer coated thereon as well as an additional outer layer of a suitable transparent photoconductive material.
  • Any number of various films in the art may be utilized with equal efficiency in this type of apparatus, such as those disclosed in US Pats. Nos. 3,290,147; 3,314,788; and 3,615,404, which are herein incorporated by reference.
  • An operator places a microfiche within the photocopying machine and sequentially records images of documents on individual frames in the microfiche.
  • the number of frames in a microfiche might be sixty or more, and it is common for the operator to record document information on several of the frames and then remove the microfiche for storage until later information is desired to be recorded on other frames of the microfiche.
  • the operator When the partially imaged microfiche is re turned to the copying machine for further recording of document information, the operator must selectively position the first unimaged frame which sequentially follows the last imaged frame onto the imaging optical axis. While this can be done by the operator noting the position of the last imaged frame and pressing an indexing control button to move the next frame into position, this method is time consuming and subject to error. If the operator erroneously selects a previously imaged frame and proceeds to project a new image upon that frame, he could superimpose additional data upon the frame, perhaps resulting in obliteration of the previous image.
  • the apparatus of the invention employs the light transmitting and reflecting properties of the photoconductive layer of a microfiche.
  • the surface of the photoconductive layers used in transparent electrophotographic recording mediums specularly reflect a beam of light from the surface when undeveloped with toner particles.
  • the dark toned areas significantly reduce the light transmission and reflecting properties of the photoconductive layer.
  • the magnitude or intensity of the light reflected from or passed through the toned area on the photoconductive layer will be significantly reduced.
  • the invention includes signal-light projection means for projecting light to a predetermined position on a selected frame of the photographic recording medium, and signal-light detection means positioned to receive and detect the intensity of the signal light coming from the photographic recording medium.
  • the preferred form of the invention includes means within a photographic recording apparatus associated with the invention for causing the predetermined position of each frame to be toned upon imaging the frame, whereby the intensity of the signal light received by the signal-light detection means is reduced if the frame has been exposed.
  • FIG. 1 is a diagramatic sectional view showing an electrophotographic recording apparatus within which the invention is employed.
  • FIG. 2 is a plan view of a microfiche useful with the invention, illustrating several exposed frames.
  • FIG. 3 is an enlarged partial view of an imaged frame of the microfiche illustrated in FIG. 2.
  • the electrophotographic recording apparatus in which the present invention is preferably used is diagramatically illustrated in FIG. 1.
  • the apparatus includes an enclosure I0 having top panel with a trans parent copyboard 15 upon which the document 16 to be copied is placed.
  • a projection lamp 17 which reflects a light off of document 16 onto mirror 14 where the image is projected along imaging optical axis 18, through a lens 19 mounted in a charge and image module 13, and onto the selected frame of a microfiche 12.
  • a'corona charging needle 20 Within the charge and image module 13 is a'corona charging needle 20, which is charged by aconventional high voltage potential (not shown) to produce a corona and electrostatically charge the photoconductive layer of the frame positioned against the module 13.
  • the charge and image module 13 includes mask 21, forming an opening 22 against which the selected frame on the microfiche 12 is positioned.
  • the light image from the document is projected onto the photoconductive layer of the frame being imaged to pattern dissipate the charge and produce a latent electrostatic image.
  • the imaged frame can be rendered visible by applying electrostatically charged developer particles, such as carbon particles, to the imaged surface where the particles adhere in the image pattern to the surface ofthe photoconductive layer by electrostatic attraction.
  • a permanent visible image can be obtained. for example. by using developer particles which can be heat fused to the photoconductive layer and subjecting it to a heat application step.
  • the developing steps are most conveniently accomplished at a location away from the charge and image module 13 by any conventional developing means.
  • the preferred form of the invention is an exposedframe indicator which includes dark mask means 27 at the border regions of the copyboard 15 for producing a dark border region around the imaged frame of the microfiche.
  • FIG. 3 illustrates an imaged frame of the microfiche 12 of FIG. 2, where 31 generally indicates the boundaries of this particular frame, 32 illustrates the dark border formed by imaging the document through a copyboard 15 having dark mask means 27, and 33 illustrates data recorded from the document.
  • the invention further includes light projection means 23 which directs a beam of light 24, onto dark border region 32 of the imaged frame and a signal-light detector 26 which detects the reflected signal light from the .surface of the photoconductive layer.
  • the signal-light detection means 26 can be provided by a conventional photocell which can measure the intensity oflight it receives.
  • the projection means 23 is located adjacent the border of the copyboard 15 so that the signal light beam 24 is assured of being projected onto the predetermined position of the frame where the dark border 32 will be developed.
  • the signal-light detecting means 26 be mounted within the charge and image module 13 at a position off of the imaging axis 18 so that it does not interfere with imaging of the microfiche. This arrangement can be satisfactorily accomplished because the surface of the photoconductive layer spccularly reflects light at an angle which directs the reflected beam of light out of the imaging axis 18.
  • the highly reflective surface of an undeveloped photoconductive layer reflects a relatively strong light beam to the signal-light means 26. But, after development of a particular frame, whereupon dark toner particles are deposited and fused to form a dark border region 32, the intensity of the reflected signal light is significantly diminished, and the reduced signal is detected by the detector means 26.
  • An electric signal dependent upon the magnitude of the signal light received by the signal-light detection means 26' can be produced by conventional means for purposes of informing the operator that the frame has already been exposed. The operator can be informed by a warning light and/or electrical control means to prevent inadvertent re-imaging of an already imaged frame.
  • the data recorded upon an imaged frame does not have to be in the form of a dark border, although this is preferable in that it also produces an attractive arrangement on the imaged microfiche and it permits wide latitude in placing the signal-light projection and detection means 23 and 26.
  • the data could also be in the form of a single dark mark imaged at the predetermined position 25 on the frame, or a number of marks or particular figures (including numerals and letters) which would produce a varying intensity or magnitude reflected signal light, the intensity or magnitude of which depends upon the number of or type of figures. With this latter arrangement, it would be possible to detect such information as frame number or other identifying information,
  • the positions of the signal-light projection means 23 and signal-light detection means 26 could be altered, although these particular positions are highly advantageous for the microphotographic recording apparatus illustrated in FIG. 1.
  • the projection means 23 and detection means 26 could be in reverse position.
  • the detection means 26 could also be outside of the module 13, or even on the opposite side of the film 12, in which case the signal-light detection means would determine the intensity of the light beam 24 passing through the film 12.
  • the microfiche 12 is commonly positioned in a carrier (not shown)
  • a further arrangement which could be utilized is the use of multiple signal-light projection means, each projecting a beam to a different predetermined position 25 on the frame, with either one or a plurality of signal-light detection means receiving the reflected light.
  • the photographic recording medium reflects light diffusely, rather than spccularly or the signal-light projection means 23 could be an ordinary lamp casting light in all directions rather than in a beam.
  • the signal light is projected in a beam and the light is specularly reflected.
  • a spccularly reflected beam oflight will form a cone shape beam with equal light intensity at all positions in the cone for equal distances from the reflecting surface. Therefore, the placement of the signallight detection means 26 is not limited to a single line, but can be placed over a larger area.
  • an exposedframe detector comprising:
  • signal-light projection means for projecting light to a predetermined position on each frame of the photographic recording medium; signal-light detection means positioned to receive the signal light leaving the photographic recording-medium and for detecting the magnitude of the signal light leaving the photographic recording medium; and t means within the apparatus for causing the predetermined position of each frame to change its optical properties upon developing an image on the frame. whereby the magnitude of the signal light received be the signal-light detection means is reduced,
  • signal-light projection means for projecting a beam of light to the predetermined position of a selected frame, whereby the light is reflected from the surface of the photoconductive layer in a reflected beam and the amount of light reflected is dependent upon the data recorded at the predetermined position;
  • signallight detection means positioned in the path of the reflected beam for detecting the intensity of the reflected signal-light.
  • an apparatus for selectively imaging discrete frames on a transparent electrophotographic microfiche comprising document holding means for holding a document to be imaged on the microfiche, means for projecting the image of the document along an optical axis to a selected frame on the microfiche, and a charge and image module positioned on the optical axis and including a lens and electrostatic charging element, an apparatus for detecting data recorded in a predetermined position on each frame of the microfiche comprising:
  • signal-light projection means mounted adjacent the border of the document holding means for projecting a signal light in a beam through the lens and onto the predetermined position of the selected frame, whereby the light is specularly reflected from the surface of the microfiche in a beam, the intensity of which is dependent upon the data recorded at the predetermined position;
  • signal-light detecting means for detecting the intensity of the reflected signal light and positioned in the path of the reflected beam and within the charge and image module.
  • Apparatus for detecting data according to claim 5, wherein the signal light detecting means is positioned off of the optical axis, whereby it does not interfere with imaging of the microfiche.
  • a method of detecting whether a frame has been on the photographic recording medium comprising the steps of:
  • measuring with light detection means the intensity of the signal light reflected from the predetermined position to thereby determine whether the frame has been exposed.
  • an apparatus for selectively imaging discrete frames on a transparent electrophotographic microfiche comprising document holding means for holding a document to be imaged on the microfiche, means to project the image of the document along an optical axis to a selected frame on the microfiche, and a charge and image module positioned on the optical axis and including a lens and electrostatic charging element,

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Projection-Type Copiers In General (AREA)
US459197A 1974-04-08 1974-04-08 Method and apparatus for detecting data on a photographic recording medium Expired - Lifetime US3873213A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US459197A US3873213A (en) 1974-04-08 1974-04-08 Method and apparatus for detecting data on a photographic recording medium
GB14210/75A GB1510532A (en) 1974-04-08 1975-04-07 Method and apparatus for detecting data on a photographic recording medium
BE1006578A BE827656A (fr) 1974-04-08 1975-04-07 Procede et appareil de detection de donnees sur un support d'enregistrement photographique
CA223,993A CA1044304A (en) 1974-04-08 1975-04-07 Method and apparatus for detecting data on a photographic recording medium
DE19752515327 DE2515327A1 (de) 1974-04-08 1975-04-08 Verfahren und vorrichtung zum erfassen von daten auf einem photographischen aufzeichnungsmedium
FR7510976A FR2266907B1 (enrdf_load_stackoverflow) 1974-04-08 1975-04-08
JP50041908A JPS5817954B2 (ja) 1974-04-08 1975-04-08 シヤシンキロクバイタイジヨウノ デ−タケンシユツノホウホウトソウチ

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Application Number Priority Date Filing Date Title
US459197A US3873213A (en) 1974-04-08 1974-04-08 Method and apparatus for detecting data on a photographic recording medium

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US3873213A true US3873213A (en) 1975-03-25

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US459197A Expired - Lifetime US3873213A (en) 1974-04-08 1974-04-08 Method and apparatus for detecting data on a photographic recording medium

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US (1) US3873213A (enrdf_load_stackoverflow)
JP (1) JPS5817954B2 (enrdf_load_stackoverflow)
BE (1) BE827656A (enrdf_load_stackoverflow)
CA (1) CA1044304A (enrdf_load_stackoverflow)
DE (1) DE2515327A1 (enrdf_load_stackoverflow)
FR (1) FR2266907B1 (enrdf_load_stackoverflow)
GB (1) GB1510532A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348104A (en) * 1981-01-23 1982-09-07 Energy Conversion Devices, Inc. Double exposure control for microfiche recording system
US4561769A (en) * 1983-09-19 1985-12-31 Fuji Photo Film Co., Ltd. Combined camera and viewer
US4955032A (en) * 1988-04-22 1990-09-04 A. B. Dick Company Method and apparatus for mapping frames of an updatable electrophotographic medium
US4987439A (en) * 1989-09-11 1991-01-22 Eastman Kodak Company Sensing magnetic recording on film of series scence indication an use thereof in a photofinishing system
FR2798479A1 (fr) * 1999-09-14 2001-03-16 Thierry Pinte Dispositif pour la realisation d'une bordure noire ou coloree lors du tirage d'une photographie
US20040175093A1 (en) * 2003-01-14 2004-09-09 Quad/Tech Uk Ltd. Scanning heads

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59146750A (ja) * 1983-02-14 1984-08-22 Daito Kogyo Kk 溶接開先部分の研磨方法
JPS62133475A (ja) * 1985-12-04 1987-06-16 Fuji Photo Film Co Ltd 未定着駒の定着方法
DE9413675U1 (de) * 1994-08-25 1994-10-27 Dst Deutsche System-Technik Gmbh, 28307 Bremen Abtasteinrichtung für Filmlochkarten

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US2760404A (en) * 1953-12-31 1956-08-28 Internat Telemeter Corp Photographic memory
US3240114A (en) * 1961-11-17 1966-03-15 Jonker Business Machines Inc Information storage and retrieval copy apparatus
US3299272A (en) * 1963-02-09 1967-01-17 Ricoh Kk Photosensitive system for taking out desired portions of records on microfilm
US3418905A (en) * 1965-12-30 1968-12-31 Polaroid Corp Photoresponsive film supply monitoring apparatus for a photographic camera
US3469105A (en) * 1967-09-05 1969-09-23 Itek Corp Photoelectric apparatus for detecting the borders of information bearing regions of records
US3523495A (en) * 1968-03-15 1970-08-11 Ibm Apparatus for forming circuit masks on photosensitized screens and inspecting the same and/or inspecting substrates having conductive circuit patterns
US3549254A (en) * 1968-10-23 1970-12-22 Stromberg Datagraphix Inc Optical system
US3594087A (en) * 1969-11-06 1971-07-20 Baxter Laboratories Inc Optical densitometer with retroreflective means
US3597045A (en) * 1969-06-30 1971-08-03 Ibm Automatic wafer identification system and method
US3623024A (en) * 1968-02-09 1971-11-23 Us Army Signal recovery system using optical mixing
US3685912A (en) * 1970-04-01 1972-08-22 Ingenuics Inc Large area retro-transmitting light meter

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Publication number Priority date Publication date Assignee Title
US3251761A (en) * 1962-08-28 1966-05-17 Bayer Ag Process for the production of organic compounds containing nitrogen and chlorine combined in an-n=ccl-radical
DE2128241A1 (de) * 1971-06-07 1973-01-04 Audac Corp Aufzeichnungssystem

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2760404A (en) * 1953-12-31 1956-08-28 Internat Telemeter Corp Photographic memory
US3240114A (en) * 1961-11-17 1966-03-15 Jonker Business Machines Inc Information storage and retrieval copy apparatus
US3299272A (en) * 1963-02-09 1967-01-17 Ricoh Kk Photosensitive system for taking out desired portions of records on microfilm
US3418905A (en) * 1965-12-30 1968-12-31 Polaroid Corp Photoresponsive film supply monitoring apparatus for a photographic camera
US3469105A (en) * 1967-09-05 1969-09-23 Itek Corp Photoelectric apparatus for detecting the borders of information bearing regions of records
US3623024A (en) * 1968-02-09 1971-11-23 Us Army Signal recovery system using optical mixing
US3523495A (en) * 1968-03-15 1970-08-11 Ibm Apparatus for forming circuit masks on photosensitized screens and inspecting the same and/or inspecting substrates having conductive circuit patterns
US3549254A (en) * 1968-10-23 1970-12-22 Stromberg Datagraphix Inc Optical system
US3597045A (en) * 1969-06-30 1971-08-03 Ibm Automatic wafer identification system and method
US3594087A (en) * 1969-11-06 1971-07-20 Baxter Laboratories Inc Optical densitometer with retroreflective means
US3685912A (en) * 1970-04-01 1972-08-22 Ingenuics Inc Large area retro-transmitting light meter

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4348104A (en) * 1981-01-23 1982-09-07 Energy Conversion Devices, Inc. Double exposure control for microfiche recording system
US4561769A (en) * 1983-09-19 1985-12-31 Fuji Photo Film Co., Ltd. Combined camera and viewer
US4955032A (en) * 1988-04-22 1990-09-04 A. B. Dick Company Method and apparatus for mapping frames of an updatable electrophotographic medium
US4987439A (en) * 1989-09-11 1991-01-22 Eastman Kodak Company Sensing magnetic recording on film of series scence indication an use thereof in a photofinishing system
US5027140A (en) * 1989-09-11 1991-06-25 Eastman Kodak Company Magnetic recording on film of series scene indication by a camera for use by a photofinisher
FR2798479A1 (fr) * 1999-09-14 2001-03-16 Thierry Pinte Dispositif pour la realisation d'une bordure noire ou coloree lors du tirage d'une photographie
EP1085369A1 (fr) * 1999-09-14 2001-03-21 Thierry Pinte Dispositif pour la réalisation d'une bordure noire ou colorée lors du tirage d'une photographie
US20040175093A1 (en) * 2003-01-14 2004-09-09 Quad/Tech Uk Ltd. Scanning heads
GB2401678A (en) * 2003-01-14 2004-11-17 Qti Presstech Ltd Improvements to scanning heads
GB2401678B (en) * 2003-01-14 2005-08-17 Qti Presstech Ltd Improvements to scanning heads
US7119820B2 (en) 2003-01-14 2006-10-10 Quad/Tech, Inc. Scanning heads

Also Published As

Publication number Publication date
DE2515327A1 (de) 1975-10-09
FR2266907B1 (enrdf_load_stackoverflow) 1979-08-03
JPS50146341A (enrdf_load_stackoverflow) 1975-11-25
JPS5817954B2 (ja) 1983-04-11
CA1044304A (en) 1978-12-12
GB1510532A (en) 1978-05-10
BE827656A (fr) 1975-10-07
FR2266907A1 (enrdf_load_stackoverflow) 1975-10-31
DE2515327C2 (enrdf_load_stackoverflow) 1989-05-18

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