US20160061458A1 - Steam Injection System and Method - Google Patents

Steam Injection System and Method Download PDF

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Publication number
US20160061458A1
US20160061458A1 US14/743,907 US201514743907A US2016061458A1 US 20160061458 A1 US20160061458 A1 US 20160061458A1 US 201514743907 A US201514743907 A US 201514743907A US 2016061458 A1 US2016061458 A1 US 2016061458A1
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United States
Prior art keywords
water
reservoir
steam
drain
compartment
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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.)
Abandoned
Application number
US14/743,907
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English (en)
Inventor
Jeroen van der Linden
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BE Aerospace Inc
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BE Aerospace Inc
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Publication date
Application filed by BE Aerospace Inc filed Critical BE Aerospace Inc
Priority to US14/743,907 priority Critical patent/US20160061458A1/en
Assigned to B/E AEROSPACE, INC. reassignment B/E AEROSPACE, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VAN DER LINDEN, JEROEN
Priority to CN201580047341.7A priority patent/CN106604665B/zh
Priority to PCT/US2015/047398 priority patent/WO2016036594A1/en
Priority to EP15837642.6A priority patent/EP3188624B1/en
Publication of US20160061458A1 publication Critical patent/US20160061458A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/327—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation with air moisturising
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F24C7/088—Arrangement or mounting of control or safety devices of electric circuits regulating heat on stoves
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/14—Cooking-vessels for use in hotels, restaurants, or canteens
    • A47J27/16—Cooking-vessels for use in hotels, restaurants, or canteens heated by steam

Definitions

  • an oven steam injection system for heating food in an oven cavity, and particularly, a vehicle oven that directly injects steam into the oven cavity.
  • Prior ovens for use in vehicles, such as aircraft typically have several elements disposed within the oven cavity and generate steam within the cavity.
  • Such ovens typically include a heating element, a ventilator, and a baffle plate to control an induced air flow inside the oven cavity.
  • These additional elements in the oven cavity result in long heating times and typically require a high cavity temperature, which also results in a high external oven temperature.
  • an oven steam injection system includes an oven having a compartment enclosed on all sides, a door on a front side of the compartment, the door operable to open the compartment, and a steam injector disposed inside the compartment.
  • the system includes a steam generator having a heater reservoir and a heating element operable to heat water within the heater reservoir to generate steam, the steam generator operable to inject steam into the compartment through the steam injector.
  • a method of injecting steam into an oven includes providing water in a heater reservoir that is disposed outside of a compartment of the oven, heating the water in the heater reservoir by a heating element to generate steam, and injecting steam from the heater reservoir into the compartment through a steam injector disposed in the compartment.
  • embodiments of the apparatus are not limited to ovens for use in an aircraft galley.
  • embodiments of the apparatus may be adapted for a refrigerator, freezer, and other food storage and cooking devices.
  • Various embodiments may thus be used in any vehicle, including aircraft, spacecraft, ships, buses, trains, recreational vehicles, trucks, automobiles, and the like.
  • Embodiments of the apparatus may also be used in homes, offices, hotels, factories, warehouses, garages, and other buildings where it may be desirable to heat food with steam. In general, the embodiments may be used in any location or application in which heating food with steam is desired.
  • FIG. 1A is a pictorial front view of an oven in an oven steam injection system according to an embodiment, shown with an open door;
  • FIG. 1B is a pictorial front view of an oven in an oven steam injection system according to another embodiment utilizing a fan and baffles, shown with an open door;
  • FIG. 2A is a schematic view of an oven steam injection system that uses heating elements below the oven cavity, according to an embodiment
  • FIG. 2B is a schematic view of an oven steam injection system, according to another embodiment
  • FIG. 2C is a schematic view of an oven steam injection system that uses a fan and baffles, according to another embodiment
  • FIG. 2D is a schematic view of an oven steam injection system that uses heating elements below the oven cavity, according to another embodiment
  • FIG. 2E is a schematic view of an oven steam injection system that uses heating elements below the oven cavity, according to another embodiment
  • FIG. 3 is a top view of an arrangement of heating elements on the bottom of the oven cavity
  • FIG. 4 is a flowchart of a method of controlling an oven steam injection system, according to an embodiment.
  • FIG. 5 is a flowchart of a method of controlling the amount of water in an oven steam injection system, according to an embodiment.
  • FIG. 1A is a front view of an oven with a door 13 in an open position to show an oven cavity 1 .
  • the oven cavity 1 defines a confined space where meals are heated prior to consumption. Steam that is generated outside of the oven cavity 1 is directly injected into the oven cavity 1 via one or more holes 2 a of a steam injector 2 provided along a back wall 14 to heat the food provided therein.
  • FIG. 1A shows a plurality of holes 2 a in a line, the holes could be arranged in a two-dimensional grid of any shape. The size, shape, and number of holes can be varied without departing from the spirit and scope of the invention.
  • Oven cavity 1 is provided with raisers 16 on a bottom 15 of the oven cavity 1 to aid in the draining of condensed water from oven cavity 1 .
  • the raisers 16 provide a place upon which oven contents, such as a tray, can rest and not be in contact with the floor 15 or water that accumulates in the floor 15 .
  • FIG. 1B is a front view of another embodiment having various other features. Instead of a plurality of holes 2 a, as is illustrated in FIG. 1A , a single hole 2 a forms the mechanism by which steam is provided to the cavity 1 . To distribute the steam evenly, a fan 23 is located behind baffles 22 that spread the steam out. Additional heaters 21 , which may be made of a positive temperature coefficient (PTC) material, or comprise conventional resistor-type heating mechanisms, may be located outside of the oven and attached to the bottom 15 .
  • FIG. 1B also illustrates a temperature sensor 19 that can be used to provide information back to a controller (described below). Any of the embodiments discussed herein may include such a temperature sensor 19 .
  • PTC positive temperature coefficient
  • FIG. 2A is a schematic of an embodiment of an oven steam injection system S 1 .
  • Steam is generated in a steam generator 3 having a heater reservoir. Steam generated in the steam generator 3 is directly injected into the oven cavity 1 through the steam injector 2 , which is communicatively coupled to the steam generator 3 .
  • the steam generator 3 is located outside the oven cavity 1 and is dedicated to the preparation of steam.
  • a heater element 4 contacts a bottom surface of the steam generator 3 and is operable to heat the steam generator 3 to convert the water in the heater reservoir of steam generator 3 into steam.
  • Steam from the steam generator 3 is injected into the oven cavity 1 , thereby heating the food in the oven cavity 1 .
  • the steam condenses into water, which is then collected at a bottom 15 of the oven cavity 1 , which may be recycled for subsequent use.
  • a cavity drain pump 6 is provided to pump the water collected at the bottom 15 to a drain reservoir 7 .
  • the system 51 is further provided with a generator supply pump 5 , which is operable to pump water from the drain reservoir 7 to the heater reservoir in steam generator 3 .
  • the water condensed in oven cavity 1 is again generated into steam in the steam generator 3 and injected into the oven cavity 1 through steam injector 2 .
  • Drain reservoir 7 is provided with a drain reservoir level sensor 12 for detecting a level of water in the drain reservoir 7 .
  • a drain reservoir level sensor 12 for detecting a level of water in the drain reservoir 7 .
  • an oven water supply valve 8 is opened to supply water to the drain reservoir 7 from a main water supply 10 .
  • the main water supply 10 could, for example, be an aircraft main water supply.
  • the oven water supply valve 8 is closed to stop the supply of water to the drain reservoir 7 from the main water supply 10 .
  • the heater reservoir of the steam generator 3 is provided with a generator level sensor 11 for detecting a level of water in the heater reservoir of the steam generator 3 .
  • the generator supply pump 5 is operated to pump water from the drain reservoir 7 to the steam generator 3 .
  • the generator supply pump 5 is stopped to stop the flow of water from the drain reservoir 7 to the steam generator 3 .
  • a generator drain valve 9 operatively coupled to the steam generator 3 is opened to drain water from the steam generator 3 to the drain reservoir 7 .
  • the generator drain valve 9 is closed to stop the draining of water from the steam generator 3 .
  • the generator supply pump 5 is operated to pump water to the heater reservoir of steam generator 3 .
  • an optional reserve drain valve 17 is opened to allow water to go to the aircraft drain. Once the level of water in the drain reservoir 7 is below its high level drain threshold 7 b, the generator supply pump 5 can be stopped and the reserve drain valve 17 closed.
  • the optional reserve drain valve 17 can also be present in any of the embodiments described herein. Any other mechanism for removing excess water may also be provided.
  • controller 20 may be connected to any or all of the controllable and sensing elements described herein, including heater element 4 , supply pump 5 , cavity drain pump 6 , water supply valve 8 , generator drain valve 9 , level sensors 11 , 12 , and drain valve 17 .
  • heaters 21 can be added to a side, such as the bottom 15 , of the oven cavity 1 .
  • These heaters can take on any form, but, in an embodiment, can be positive temperature coefficient (PTC) heaters that are self-controlled and do not need an extra control system to avoid overheating. This is because the natural resistance of the material used for the heaters will not allow the heaters to exceed some predetermined temperature.
  • PTC positive temperature coefficient
  • This heater 21 can be present in any of the embodiments disclosed herein. As discussed above, a hysteresis curve could be used for any of the high level and low-level values to more efficiently control the process.
  • FIG. 2B is a schematic of another embodiment of an oven steam injection system S 2 .
  • the drain reservoir 7 is disposed below the oven cavity 1 .
  • the oven cavity 1 can be extended to serve as a drain reservoir 7 (e.g., gravity fed), similar to a wet sump. Steam injected into the oven cavity 1 condenses and is fed into the drain reservoir 7 by gravity from the bottom 15 of the oven cavity 1 . Condensed water from the drain reservoir 7 can then be pumped to the steam generator 3 by the generator supply pump 5 .
  • the system S 2 in FIG. 2B does not require the cavity drain pump 6 of the system S 1 shown in FIG. 2A , although this design is more susceptible to issues related to aircraft orientations that differ from horizontal, which the FIG. 2A embodiment deals with more robustly.
  • any mix of system components from system S 1 and system S 2 is also possible.
  • the injection of externally created steam into the oven cavity 1 induces a large acceleration of air and steam inside the cavity, which provides the large condensation heat flux necessary for the rapid temperature rise of the meals being heated in the oven cavity 1 .
  • the usage of externally supplied steam also provides for a more uniform heating of the food within the oven cavity 1 . More heat energy can be provided to the steam when it is externally created, since there are not the same size limitations for a heating unit to heat the steam external to the cavity (and additionally, more of the space in the oven cavity is available for food). Saturated steam injected into the oven cavity 1 condenses on the coldest spots, thereby automatically reducing temperature differences. Thus, the temperature difference between meals heated in the oven cavity 1 is significantly reduced due to the nature of the heating process.
  • a minimum meal temperature is demanded when heated for consumption.
  • temperature differences among the meals being heated are large, more energy is required to meet this minimum meal temperature requirement because many meals will be heated to a higher temperature.
  • a reduced temperature difference among meals in the oven cavity will therefore save heating energy by reducing the temperature the oven needs to reach to sufficiently heat each of the meals, and prevent the meals from being overcooked.
  • the maximum internal temperature of the oven cavity 1 can be reduced to, for example, just slightly above the condensation temperature of saturated steam, since internal heating elements going significantly above this temperature to create the steam are not present. This reduces the outside temperature of the housing or casing of the oven, thereby improving the safety of the oven to users. Additionally, because the internal temperature of the oven cavity 1 is reduced relative to prior ovens, less insulation material can be applied. This results in weight savings that are particularly important in aircraft oven systems and reduction in the cost of the oven system.
  • the oven cavity 1 does not need to include a ventilator, a heating element, and a baffle plate that controls the induced air flow, among others.
  • the oven cavity 1 does not need to include a ventilator, a heating element, and a baffle plate that controls the induced air flow, among others.
  • steam is directly injected into the oven cavity 1 , structures that were previously necessary to generate steam within an oven cavity, such as a fan, are not necessary.
  • these structures act as a parasitic thermal mass in the system that would need to be heated along with the food in the oven due to their presence within the oven cavity.
  • oven steam injection systems eliminate the need for several structures internal to the oven cavity 1 , the oven can have a faster response and heating relative to prior ovens, thereby improving heating efficiency and energy savings.
  • the water used to generate steam can be recycled, thereby providing additional weight savings.
  • Prior systems that rely entirely upon a main water supply, such as an aircraft water reserve, without recycling the condensed water in the oven cavity use more of the water reserve than necessary.
  • the use of the main water supply can be reduced, thereby saving weight by reducing the water reserve that is required.
  • FIG. 2C illustrates such an embodiment that is similar to the embodiment shown in FIG. 2A , but that includes a baffle 22 and fan 23 with a fan motor 24 .
  • the steam injector 2 introduces the steam to the oven cavity 1 at a single point.
  • the fan blades 23 rotate to move the steam from its introduction point 2 throughout the cavity 1 .
  • the baffle plate 22 allows the fan 23 to more effectively move the steam to more distant parts of the cavity 1 .
  • a tradeoff is made between the complexity of the steam introduction to the cavity 1 and the inclusion of the baffle 22 , fan 23 , and its motor 24 .
  • FIG. 2D is a schematic diagram illustrating a further embodiment.
  • This embodiment includes the baffle 22 , fan 23 , and motor of the prior embodiment, but introduces the water 30 directly into the bottom 15 of the cavity 1 at a water input 31 .
  • the bottom has heater elements 21 , such as the PTC elements 21 described above, affixed directly to a side of the cavity 1 to have good thermal contact.
  • Water is introduced via the main water supply 10 with the oven water supply valve 8 , and utilizes a flow meter 25 to correctly introduce the proper amount of water into the cavity 1 , where the bottom portion of the cavity serves as a water reservoir (wet sump). Water exits the cavity 1 through evaporation, although other draining mechanisms, as described above, can be provided.
  • the evaporated water can still, in this design, be condensed and further used.
  • the heaters 21 can be used in any of the above-stated designs. These heaters 21 can be used both to generate steam in the cavity 1 as well as to dry out the cavity 1 without running into an overheat situation. Two alternatives are provided: in the first, water is gradually fed to the reservoir inside the cavity in which the steam is generated. In the second, all water required for the process is initially supplied (in an embodiment, this might be, e.g., 700 cc).
  • FIG. 2E provides an embodiment that reduces water consumption and avoids excessive water vapor from being ejected into the galley and avoids condensation on cold spots.
  • a pressure sensor 26 monitors the cavity pressure, and the controller 20 is used to hold the pressure at very small over pressure to the air craft cabin pressure. The over pressure would typically be no more than 20 mbar.
  • the oven starts with an air valve 32 open. At first, total air pressure builds up due to the rise of the partial pressure of the injected water vapor (steam). This mix of air and water vapor is vented through the valve 32 air opening. Once the temperature sensor 19 indicates a temperature that corresponds with the saturated vapor pressure at cabin pressure (typically 94° C.) the air valve 32 is closed.
  • the cavity is closed and over pressure is maintained by regulating the heating power.
  • approximately 200 cc of water is accumulated on the meal carrier and the meals (however, this varies with each type of oven and contents).
  • the cavity walls and floor may accumulate 100 cc of water, and, at cabin pressure the amount of water vapor that is in the cavity volume is approximately 30 g. In total, roughly 350 cc of water is evaporated and accumulated in the oven.
  • the cavity over-pressure controlled power control can anticipate cabin pressure variations and the control system is not dependent on ambient pressure of the oven. Cavity over-pressure controlled power has the potential to save water.
  • the cavity temperature could be monitored and used to control the heating power.
  • FIG. 3 is an example layout of the bottom 15 to which bottom heaters 21 have been affixed.
  • FIG. 4 is a flowchart illustrating a process of controlling an oven steam injection system, according to an embodiment.
  • the process of controlling the system can be implemented by the controller 20 having a processor communicatively coupled with a memory.
  • the process begins at step 400 where a user initiates the desired heating of food within oven cavity 1 .
  • the heating process may be based on a predetermined amount of heating time or based on reaching a desired food temperature.
  • the water level in drain reservoir 7 is detected by drain reservoir level sensor 12 and compared with a predetermined low level threshold 7 a at step 402 . If the level of water in the drain reservoir 7 is below the low level threshold 7 a, the process proceeds to step 403 .
  • water is added to the drain reservoir 7 from the main water supply 10 , and the level of water is detected again.
  • step 402 If the level of water in drain reservoir 7 is not below the low level threshold 7 a at step 402 , the process proceeds to step 404 where the level of water in the heater reservoir of steam generator 3 is detected by the generator level sensor 11 . If the level of water in the heater reservoir 3 c is below a low level threshold 3 a, the process proceeds to step 406 where water is pumped to the heater reservoir 3 c from drain reservoir 7 by operating generator supply pump 5 . The process then returns to steps 404 and 405 where the level of water in the heater reservoir 3 c is detected and compared to the low threshold 3 a.
  • step 407 the water in the heater reservoir 3 c is heated by the heating element 4 to generate steam within the steam generator 3 .
  • the steam generated in steam generator 3 is injected into the oven cavity 1 through the steam injector 2 .
  • water is collected at the bottom 15 of the oven cavity at step 409 .
  • the condensed water is then transferred to drain reservoir 7 at step 410 .
  • the cavity drain pump 6 pumps the collected water to the drain reservoir 7 .
  • water is collected in drain reservoir 7 by the force of gravity on the condensed water.
  • the system determines whether heating has concluded. For example, if the heating process is based on a predetermined heating time, a timer may be included for tracking the time of the process. Once the elapsed time tracked by the timer reaches the predetermined heating time, the process terminates at step 412 . If the elapsed time has not yet reached the predetermined heating time, the process proceeds to step 401 where the process is repeated. Alternatively, for example, the heating process may be based upon reaching a desired food temperature.
  • a temperature sensor 19 for detecting the food temperature within the oven cavity 1 , and transmitting the food temperature to a controller in the system, may be provided. This temperature sensor can either monitor air temperature within the oven cavity 1 , or can measure the temperature of the food directly, such as via a probe or via an infra-red sensor reading.
  • the process terminates at step 412 . If the food temperature has not yet reached the desired food temperature, the process proceeds to step 401 where the process is repeated.
  • the processor may determine a proper amount of steam to send to the food based on a measured temperature and knowledge of a desired temperature, and may also use a time history of the warming temperature to adapt to the thermal mass being heated. Based on these determinations, it can determine how much steam to deliver to ensure a correct temperature is reached.
  • the condensing pressure has reached cabin pressure, the power should be controlled in order to avoid excess evaporation that will only escape into the cabin.
  • FIG. 5 is a flowchart illustrating a process for controlling the water in an oven steam injection system, according to an embodiment.
  • FIG. 5 depicts steps that may occur between steps 401 and 404 shown in FIG. 4 .
  • the level of water in the drain reservoir 7 detected by the drain reservoir level sensor 12 exceeds the low level drain threshold 7 a (NO at step 402 )
  • the level of water in the drain reservoir 7 is compared with a high level drain threshold 7 b at step 501 . If the level of water in the drain reservoir 7 is determined to exceed the high level drain threshold (YES at step 501 ), the level of water in the heater reservoir is 3 c detected at step 502 and compared with a high level heater threshold 3 b at step 503 .
  • the reserve drain 17 is opened at step 505 to allow water to return to the main water supply 10 from the drain reservoir 7 .
  • the process then returns to step 401 .
  • the generator supply pump 5 is operated to pump water from the drain reservoir 7 to the heater reservoir 3 c at step 504 . The process then returns to step 401 .
  • step 501 Once the level of water in the drain reservoir 7 is below its high level threshold 7 b (NO at step 501 ), the generator supply pump 5 can be stopped and the reserve drain valve 17 closed, if necessary, at step 506 . The process then continues with step 404 and subsequent steps as described above.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cookers (AREA)
US14/743,907 2014-09-02 2015-06-18 Steam Injection System and Method Abandoned US20160061458A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US14/743,907 US20160061458A1 (en) 2014-09-02 2015-06-18 Steam Injection System and Method
CN201580047341.7A CN106604665B (zh) 2014-09-02 2015-08-28 蒸汽喷射系统和方法
PCT/US2015/047398 WO2016036594A1 (en) 2014-09-02 2015-08-28 Steam injection system and method
EP15837642.6A EP3188624B1 (en) 2014-09-02 2015-08-28 Steam injection system and method

Applications Claiming Priority (2)

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US201462044714P 2014-09-02 2014-09-02
US14/743,907 US20160061458A1 (en) 2014-09-02 2015-06-18 Steam Injection System and Method

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US (1) US20160061458A1 (zh)
EP (1) EP3188624B1 (zh)
CN (1) CN106604665B (zh)
WO (1) WO2016036594A1 (zh)

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EP3551936A4 (en) * 2016-12-06 2020-08-05 Whirlpool Corporation HUMIDITY CONVECTION FOR MICROWAVE OVEN
US20220003426A1 (en) * 2020-03-10 2022-01-06 Koninklijke Fabriek Inventum B.V. Water Drip Collector for Steam Generation
US11305301B2 (en) 2017-04-10 2022-04-19 The Procter & Gamble Company Microfluidic delivery device for dispensing and redirecting a fluid composition in the air
EP4015915A1 (en) * 2020-12-21 2022-06-22 Koninklijke Fabriek Inventum B.V. Device comprising a content volume measurement, oven configured for measuring a content volume, and computer readable medium
US11633514B2 (en) 2018-05-15 2023-04-25 The Procter & Gamble Company Microfluidic cartridge and microfluidic delivery device comprising the same
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EP3188624A4 (en) 2018-05-30
EP3188624A1 (en) 2017-07-12

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