US3827414A - Exhaust recirculation - Google Patents
Exhaust recirculation Download PDFInfo
- Publication number
- US3827414A US3827414A US00291115A US29111572A US3827414A US 3827414 A US3827414 A US 3827414A US 00291115 A US00291115 A US 00291115A US 29111572 A US29111572 A US 29111572A US 3827414 A US3827414 A US 3827414A
- Authority
- US
- United States
- Prior art keywords
- downstream
- upstream
- exhaust
- throttle valve
- idle
- 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
Links
- 238000004064 recycling Methods 0.000 claims abstract description 65
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 53
- 239000007789 gas Substances 0.000 claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 17
- 230000006698 induction Effects 0.000 abstract description 14
- 230000001133 acceleration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
- F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/36—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for adding fluids other than exhaust gas to the recirculation passage; with reformers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/21—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system with EGR valves located at or near the connection to the intake system
Definitions
- ABSTRACT Automobile engine exhaust gases are recycled through a recycling duct having a restricted upstream end opening into the exhaust system and first and second restricted downstream ends opening into the carbure- Aug. 6, 1974 tor inlet induction conduit downstream and upstream respectively of the throttle valve.
- the restrictions for the recycling duct are dimensioned with respect to each other so that when the throttle valve is at its closed or idle position, a major quantity of the air required to support engine combustion at idle will bypass the throttle valve and flow through the portion of the recycling duct from the second downstream end to the first.
- the second restricted downstream end opens into the induction conduit at the usual fuel metering venturi restriction and is restricted appreciably less than the first downstream end, such that when the throttle valve is opened from the idle position, the first downstream end will have only a minor influence on the pressure in the recycling duct and the exhaust gas fiow thereinto from the exhaust conduit via the restricted upstream end will be substantially a function of the pressure differential between the exhaust pressure at the upstream end and the venturi pressure at the second downstream end.
- the induction conduit pressure immediately upstream of the upstream leading edge of the blade of the throttle valve, when the latter is at its idle position, is employed to operate a valveto close the recycling duct completely at a location upstream of the two downstream ends during both idle and wide open throttle operation of the engme.
- An important object of this invention is to provide improved means comprising a minimum of moving parts for recirculating a portion of the combustion products from the exhaust system to the inlet system of an automobile engine to overcome or avoid the problems and deficiencies of the prior art, as well as to achieve a number of important results including preheating and improved mixing and carburetion of the fuel-air mixture in the inlet header and the reduction of nitrogen oxides in the exhaust.
- Another and more specific object is to provide such an exhaust recycling system comprising an exhaust recycling duct having an upstream restricted end opening into the exhaust system to receive exhaust gases and having first and second downstream restricted ends opening into the carburetor induction conduit downstream and upstream respectively of the throttle valve, the restriction at the first downstream end, i.e. downstream of the throttle valve, being appreciably greater than the restriction at the second downstream end which opens into the inlet induction conduit upstream of the throttle valve at the region of the fuel metering venturi restriction, whereby the'influence of thefirst downstream end on the pressure within the recycling duct is minor when the throttle valve is opened from its idle position.
- the exhaust recycling flow will be substantially a function of the pressure differential between the exhaust system at the upstream end of the recycling duct and the venturi pressure at the second downstream end, which pressure differential will be a function of the inlet air flow.
- the restriction for the upstream end of the recycling duct is comparable to or slightly greater than the restriction at the second downstream end and is dimensioned to obtain the desired exhaust gas recycling approximating 15 percent of the total exhaust flow, which flow will also be a function of the aforesaid pressure differential.
- communication may exist at all times between the exhaust and inlet systems but recycling of the hot exhaust gases will be reduced during idle operation.
- the high temperature of the exhaust at wide open throttle tends to reduce the exhaust density as compared to the lower temperatures during moderate acceleration, so that the effective exhaust recycling at wide open throttle is less than it would be otherwise.
- the total fluid flow through recycling restrictions or orifices of the type comprising the present invention increases at any given engine speed with increasing engine load.
- the pressure downstream of the throttle varies roughly in the neighborhood of from one half atmosphere during idling to approximately one atmosphere at wide open throttle, while while exhaust pressure simultaneously varies roughly from one to two atmospheres.
- Another object is to provide valve means cooperable with an exhaust recycling system of the above character and responsive to opening of the throttle valve for positively closing the recycling duct during idle and wide open throttle conditions, thereby to prevent all exhaust recycling during such conditions.
- FIG. 1 is a schematic fragmentary cross sectional view through an automobile engine induction system showing a system embodying the present invention for recycling exhaust gases.
- FIG. 2 is a view similar to FIG. 1, showing a modification.
- An application of the present invention is illustrated by way of example with an automobile engine 9 having a carburetor 10 providing the inlet fuel-air induction conduit 11, which comprises the upstream portion of an inlet header 12 for supplying a combustible fuel and air mixture to the engine cylinders.
- the carburetor 10 may comprise any conventional type which has the usual air inlet at the upstream end of the induction conduit 11, the usual fuel metering system including venturi restriction 13 and nozzles or jets (not shown) for supplying idle and operating fuel to the conduit 11 during various operating conditions and for enriching the fuel supply during acceleration and wide open throttle.
- An example of such a carburetor is illustrated by way of example in Ball U.S. Pat. No. 2,966,344 and the foregoing conventional features disclosed in the latter patent are incorporated herein by reference.
- the downstream portion of the induction conduit 11 comprises the customary throttle body containing the conventional butterfly type throttle valve 14 pivotal at 15.
- the inlet fuelair mixture is conducted via the header or manifold 12 to the engine cylinders. After combustion of the fuel-air mixture in the engine cylinders, the exhaust gases are discharged through a muffler to the atmosphere.
- left and right exhaust manifolds are connected by an exhaust crossover conduit 16 which conducts the hot exhaust gases into heat exchange relationship with a portion 17 of the wall of the inlet header 12.
- the wall portion 17 extends transversely to the direction of flow of the inlet mixture and is commonly referred to as the hot spot which preheats the inlet mixture and enhances vaporization and mixing of liquid fuel droplets.
- a restricted exhaust recycling duct 18 which extends directly from the exhaust cross-over conduit 16 and has an upstream orifree or restriction 19 at its lower end opening into the conduit 16 to receive exhaust gases.
- the duct 18 discharges through a first downstream restriction or orifice 20 into the header 12 directly below valve 14 and in opposition to the inlet fuel-air flow to warm the latter and to facilitate mixing and vaporization of the fuel within the inlet air.
- the nearly atmospheric inlet pressure above the valve 14 is communicated to the upper end of duct 18 via a second downstream orifice or restriction 21.
- the upper portion of duct 18 extends within the sidewall of the conduit 11 from port 19 to port 21, which latter opens into conduit 11 upstream of the valve 14 at the diffuser region of the venturi 13.
- the cross sectional area of restriction 21 is preferably 4 to 10 times as large as the cross sectional area of port 20 and is comparable in area or slightly larger than port 19.
- the orifice 21 may be comparable in size to orifice 19, or somewhat larger, and is determined so that the exhaust recycling at idle will be reduced to a value in the neighborhood of 5 percent of the total exhaust and preferably less.
- the exhaust flow through port 20 tends to maintain the temperature of the hot spot 17 during idle and also tends to heat the latter more rapidly to an effective operating temperature after a cold start.
- FIG. 2 illustrates a modification of the present invention substantially the same in concept and operation as described above, except that a pressure operated valve 22 secured to the engine 9 'is employed to prevent exhaust gas recycling at idle and wide and open throttle conditions.
- Valve 22 comprises a chamber 23 defined in part by a flexible diaphragm 24 and in communication via duct 25 with a port 26 which opens into the conduit 11 adjacent and upstream of the leading upstream edge of the blade of throttle valve 14.
- Port 26 may comprise the usual vacuum spark advance port in communication with a pressure operated spark advance mechanism via duct 27.
- a valve rod 28 secured to diaphragm 24 extends slidably and in sealing relationship through the wall of duct 18 and terminates in a valve disc 29 adopted to seat at an annular valve seat 30 comprising a coaxial portion of duct 18 downstream of restriction or orifice 19.
- a coil spring 31 within chamber 23 normally urges diaphragm 24 and rod 28 downwardly to seat valve 29 at a closed position against seat 30 whenever the pressure communicated to chamber 23 via port 26 attains or exceeds a predetermined value corresponding to idle or wide open throttle operation.
- an inlet header for conducting a combustible fuel air mixture into said engine and having I. a venturi restriction therein and 2. a throttle valve therein downstream of said venturi restriction and movable to idle and open positions for controlling fluid flow therethrough, an exhaust header for discharging combustion products from said engine, and means for recycling exhaust gases from said exhaust header to said inlet header as a function of the rate of fluid flow through said inlet header to inhibit the formation of nitrogen oxides during combustion comprising recycling duct means having 1. a restricted upstream opening communicating with said exhaust header to receive exhaust gases, and
- first and second restricted downstream openings communicating with said inlet header in parallelism with each other at locations downstream and upstream respectively of said throttle valve to discharge said exhaust gases into said inlet header
- ex- 0 haust header having a wall portion extending transversely to the flow of said fuel-air mixture in said inlet header to provide a hot wall for impingement of said mixture thereagainst, said first downstream opening extending through said hot wall in heat transfer relationship.
- said first downstream opening being directed in opposition to the flow of said fuel-air mixture at the region of said hot wall.
- said first downstream opening being smaller than said upstream opening and being dimensioned to provide a flow of inlet air bypassing said throttle amounting to the major portion of the idle combustion supporting air when said throttle valve is at its idle position.
- said second downstream opening being between approximately 4 and 10 times as large as said first downstream openmg.
- said exhaust header having a wall portion extending transversely to the flow of said fuel-air mixture in said inlet header to provide a hot wall for impingement of said mixture thereagainst, said first downstream opening extending through said hot wall in heat transfer relationship.
- said second downstream opening being between approximately 4 and 10 times as large as said first downstream openmg.
- the cross sectional areas of the restrictions for each of said upstream and second downstream openings being sufficiently large with respect to the cross sectional area of said first downstream opening to maintain a flow of exhaust gases through said upstream opening determined approximately by the pressure differential between the exhaust pressure in said exhaust header and the venturi pressure in said inlet header at the region of said second downstream opening when said throttle valve is opened a predetermined extent from said idle position.
- the cross sectional area of said second downstream opening being several times the cross sectional area of said first downstream opening.
- said first downstream opening being dimensioned to pass between approximately 50 percent and 80 percent of the air required for idle combustion when said throttle valve is at its idle position.
- said second downstream opening between located at the diffuser region of said venturi.
- said first restricted downstream opening of said recycling duct means into said inlet header comprising a throttle bypass system for idle air during idle operation of said engine, and valve means responsive to said idle operation for closing said recycling duct means at a location between said upstream restriction and said downstream restriction.
- said first downstream opening being smaller than said upstream opening and being dimensioned to provide a flow of inlet air bypassing said throttle amounting to the major portion of the idle combustion supporting air when said throttle valve is at its idle position.
- said second downstream opening being between approximately 4 and 10 times as large as said first downstream opening.
- the cross sectional area of said second downstream opening being several times larger than the cross sectional area of said first downstream opening, and means responsive to wide open throttle operation for operating said valve means to close said recycling duct means at said location.
- said valve means and means responsive to said wide open throttle operation comprising a recycling valve movable between open and closed positions to open or close respectively the communication between said upstream opening and said downstream openings at said location, and means responsive to the pressure in said inlet header upstream of said throttle valve when the latter is at its idle position for moving said recycling valve to its closed position when the last named pressure exceeds a predetermined pressure and for moving said recycling valve to its open position when said last named pressure is not greater than the first named predetermined pressure.
- said throttle valve comprising a blade type valve having an upstream leading edge
- said means responsive to the pressure in said inlet header at a location upstream of said throttle valve comprising pressure responsive means in communication with said inlet header at a location adjacent and upstream of said leading edge when said throttle valve is at its idle position, said location being downstream of said leading edge when said throttle valve is opened to a predetermined position.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00291115A US3827414A (en) | 1972-09-21 | 1972-09-21 | Exhaust recirculation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00291115A US3827414A (en) | 1972-09-21 | 1972-09-21 | Exhaust recirculation |
Publications (1)
Publication Number | Publication Date |
---|---|
US3827414A true US3827414A (en) | 1974-08-06 |
Family
ID=23118919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00291115A Expired - Lifetime US3827414A (en) | 1972-09-21 | 1972-09-21 | Exhaust recirculation |
Country Status (1)
Country | Link |
---|---|
US (1) | US3827414A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3901203A (en) * | 1973-07-23 | 1975-08-26 | Gen Motors Corp | Exhaust gas recirculation system with high rate valve |
US4005691A (en) * | 1973-04-14 | 1977-02-01 | Robert Bosch G.M.B.H. | Control installation for exhaust gas recycling |
FR2317508A2 (en) * | 1975-07-10 | 1977-02-04 | Bosch Gmbh Robert | INSTALLATION FOR THE INJECTION OF FUEL INTO AN INTERNAL COMBUSTION ENGINE |
US4030463A (en) * | 1973-08-04 | 1977-06-21 | Daimler-Benz Aktiengesellschaft | Internal combustion engine with return line for exhaust gases |
US4061119A (en) * | 1976-04-27 | 1977-12-06 | Toyota Jidosha Kogyo Kabushiki Kaisha | Exhaust gas recirculation apparatus for an internal combustion engine |
FR2355172A1 (en) * | 1976-06-17 | 1978-01-13 | Toyo Kogyo Co | EXHAUST GAS RECYCLING DEVICE |
JPS5322925U (en) * | 1976-08-05 | 1978-02-25 | ||
US4117814A (en) * | 1977-03-04 | 1978-10-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Intake regulator for internal combustion engine |
US4430982A (en) * | 1981-05-20 | 1984-02-14 | Ramirez Development Corporation | Carburetor for an internal combustion engine |
US6439212B1 (en) * | 2001-12-19 | 2002-08-27 | Caterpillar Inc. | Bypass venturi assembly and elbow with turning vane for an exhaust gas recirculation system |
US7353812B1 (en) * | 2007-03-14 | 2008-04-08 | Ford Global Technologies, Llc | Vehicle engine with integral vacuum generator |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2087116A (en) * | 1932-06-07 | 1937-07-13 | Augustin M Prentiss | Carburetor |
US2154417A (en) * | 1937-11-06 | 1939-04-18 | Harold D Church | Fuel control for internal combustion engines |
US3646923A (en) * | 1970-04-22 | 1972-03-07 | Chrysler Corp | Controlled floor jet engine exhaust recirculation |
-
1972
- 1972-09-21 US US00291115A patent/US3827414A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2087116A (en) * | 1932-06-07 | 1937-07-13 | Augustin M Prentiss | Carburetor |
US2154417A (en) * | 1937-11-06 | 1939-04-18 | Harold D Church | Fuel control for internal combustion engines |
US3646923A (en) * | 1970-04-22 | 1972-03-07 | Chrysler Corp | Controlled floor jet engine exhaust recirculation |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4005691A (en) * | 1973-04-14 | 1977-02-01 | Robert Bosch G.M.B.H. | Control installation for exhaust gas recycling |
US3901203A (en) * | 1973-07-23 | 1975-08-26 | Gen Motors Corp | Exhaust gas recirculation system with high rate valve |
US4030463A (en) * | 1973-08-04 | 1977-06-21 | Daimler-Benz Aktiengesellschaft | Internal combustion engine with return line for exhaust gases |
FR2317508A2 (en) * | 1975-07-10 | 1977-02-04 | Bosch Gmbh Robert | INSTALLATION FOR THE INJECTION OF FUEL INTO AN INTERNAL COMBUSTION ENGINE |
US4061119A (en) * | 1976-04-27 | 1977-12-06 | Toyota Jidosha Kogyo Kabushiki Kaisha | Exhaust gas recirculation apparatus for an internal combustion engine |
FR2355172A1 (en) * | 1976-06-17 | 1978-01-13 | Toyo Kogyo Co | EXHAUST GAS RECYCLING DEVICE |
JPS5322925U (en) * | 1976-08-05 | 1978-02-25 | ||
JPS5537714Y2 (en) * | 1976-08-05 | 1980-09-04 | ||
US4117814A (en) * | 1977-03-04 | 1978-10-03 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Intake regulator for internal combustion engine |
US4430982A (en) * | 1981-05-20 | 1984-02-14 | Ramirez Development Corporation | Carburetor for an internal combustion engine |
US6439212B1 (en) * | 2001-12-19 | 2002-08-27 | Caterpillar Inc. | Bypass venturi assembly and elbow with turning vane for an exhaust gas recirculation system |
US7353812B1 (en) * | 2007-03-14 | 2008-04-08 | Ford Global Technologies, Llc | Vehicle engine with integral vacuum generator |
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Owner name: FIDELITY UNION TRUST COMPANY, 765 BROAD ST., NEWAR Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 Owner name: FIDELITY UNION TRUST COMPANY, TRUSTEE,NEW JERSEY Free format text: MORTGAGE;ASSIGNOR:CHRYSLER CORPORATION;REEL/FRAME:003832/0358 Effective date: 19810209 |
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Owner name: CHRYSLER CORPORATION Free format text: PARTES REASSIGN, TRANSFER AND RELINQUISH THEIR ENTIRE INTEREST UNDER SAID PATENTS ALSO RELEASE THEIR SECURITY INTEREST.;ASSIGNOR:MANUFACTURERS NATIONAL BANK OF DETROIL (CORPORATE TRUSTEE) AND BLACK DONALD E., (INDIVIDUAL TRUSTEE);REEL/FRAME:004355/0154 Effective date: 19840905 |
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