CA2325878A1 - A holder device for holding a trailing element - Google Patents
A holder device for holding a trailing element Download PDFInfo
- Publication number
- CA2325878A1 CA2325878A1 CA002325878A CA2325878A CA2325878A1 CA 2325878 A1 CA2325878 A1 CA 2325878A1 CA 002325878 A CA002325878 A CA 002325878A CA 2325878 A CA2325878 A CA 2325878A CA 2325878 A1 CA2325878 A1 CA 2325878A1
- Authority
- CA
- Canada
- Prior art keywords
- trailing element
- slot
- open ended
- ended slot
- housing
- 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
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
- D21F1/028—Details of the nozzle section
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/02—Head boxes of Fourdrinier machines
Landscapes
- Paper (AREA)
Abstract
A holder device as disclosed for holding a trailing element (12) relative to a dovetail slot (14) of the slice chamber (16) of a headbox (18). The device includes a curved housing (20) having an upstream and a downstream end (22, 24). The upstream end (22) is secured within the dovetail slot (14). The downstream end (24) of the housing (20) defines an open ended slot (26) which extends in the cross-machine direction for the reception therein of the trailing element (12). A securing device (28) secures the trailing element (12) within the open ended slot (26).
Description
PATENT APPLICATION
The present invention relates to a holder device for holding a trailing element relative to a dovetail slot of a slice chamber of a headbox.
More specifically, the present invention relates to a holder device for holding a trailing element of a headbox for a papermaking machine.
In the papermaking art, paper stock is ejected from a slice chamber of a headbox onto a moving fourdrinier wire such that water can be removed from the moving stock in order to form a sheet therefrom.
In one type of slice chamber, the flow of stock therethrough is separated by a plurality of trailing elements each of which are secured to the inside of the slice chamber at the upstream end thereof. The downstream ends of the trailing elements are freely supported within the stock flow for improving the flow characteristics of the ejected stock.
Conventional trailing elements or CONVERFLO sheets are made of Lexan by bonding a flat sheet to a holder for securing the CONVERFLO
sheet within the slice chamber. CONVERFLO is a common law trademark of Beloit Technologies, Inc.
The present invention relates to a holder device for holding a trailing element relative to a dovetail slot of a slice chamber of a headbox.
More specifically, the present invention relates to a holder device for holding a trailing element of a headbox for a papermaking machine.
In the papermaking art, paper stock is ejected from a slice chamber of a headbox onto a moving fourdrinier wire such that water can be removed from the moving stock in order to form a sheet therefrom.
In one type of slice chamber, the flow of stock therethrough is separated by a plurality of trailing elements each of which are secured to the inside of the slice chamber at the upstream end thereof. The downstream ends of the trailing elements are freely supported within the stock flow for improving the flow characteristics of the ejected stock.
Conventional trailing elements or CONVERFLO sheets are made of Lexan by bonding a flat sheet to a holder for securing the CONVERFLO
sheet within the slice chamber. CONVERFLO is a common law trademark of Beloit Technologies, Inc.
The aforementioned holders may be of various shapes depending on the type of headbox being used. The bonding between the Lexan sheet and the holder has in the past been accomplished by use of a bonding solvent. Such solvent bonding has typically included the use of methylene chloride which is a known carcinogen. Consequently, it is desirable to eliminate the use of the aforementioned bonding agents.
Additionally, the aforementioned solvent bond tends to weaken the joint over a period of time. Therefore, a holder designed without use of bonding agent is preferable.
In a typical headbox design, the Lexan sheets are secured relative to dovetail slots defined by the upstream end of the slice chamber, such dovetail slots extending in a cross-machine direction.
Although certain headbox designs provide rigid securement of the upstream end of the Lexan sheet relative to the dovetail slot, a preferable arrangement includes provision for the upstream end of the Lexan sheet to rotate slightly relative to the dovetail slot. Such free rotation in a conventional prior art headbox is liable to set up a sheet bending mode leading to possible fracture of the Lexan sheet.
The present invention is designed to hold the flat Lexan sheet material. In one embodiment of the present invention, the holder housing can be designed to allow rotation within the dovetail connection. However, in an alternative embodiment of the present invention, the upstream end of the Lexan sheet is rigidly secured relative to the dovetail slot. With the rigid holder housing arrangement, the holder absorbs any forces resulting from fluid change or direction, a feature which is particularly desirable in thin channel nozzle designs.
Additionally, the aforementioned solvent bond tends to weaken the joint over a period of time. Therefore, a holder designed without use of bonding agent is preferable.
In a typical headbox design, the Lexan sheets are secured relative to dovetail slots defined by the upstream end of the slice chamber, such dovetail slots extending in a cross-machine direction.
Although certain headbox designs provide rigid securement of the upstream end of the Lexan sheet relative to the dovetail slot, a preferable arrangement includes provision for the upstream end of the Lexan sheet to rotate slightly relative to the dovetail slot. Such free rotation in a conventional prior art headbox is liable to set up a sheet bending mode leading to possible fracture of the Lexan sheet.
The present invention is designed to hold the flat Lexan sheet material. In one embodiment of the present invention, the holder housing can be designed to allow rotation within the dovetail connection. However, in an alternative embodiment of the present invention, the upstream end of the Lexan sheet is rigidly secured relative to the dovetail slot. With the rigid holder housing arrangement, the holder absorbs any forces resulting from fluid change or direction, a feature which is particularly desirable in thin channel nozzle designs.
Therefore, it is a primary objective of the present invention to provide a holder device for holding a trailing element which overcomes the aforementioned problems associated with the prior art devices and which provides a significant contribution to the art of papermaking.
Other advantages and objections of the present invention will be readily apparent to those skilled in the art by a consideration of the detailed description contained hereinafter taken in conjunction with the annexed drawings.
The present invention relates to a holder device for holding a trailing element relative to a dovetail slot of a slice chamber of a headbox.
The device includes a curved housing having an upstream and a downstream end. The upstream end of the housing is secured within the dovetail slot.
The downstream end of the housing defines an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element.
Means are provided for securing the trailing element within the open ended slot.
In a more specific embodiment of the present invention, the housing is of stainless steel.
Other advantages and objections of the present invention will be readily apparent to those skilled in the art by a consideration of the detailed description contained hereinafter taken in conjunction with the annexed drawings.
The present invention relates to a holder device for holding a trailing element relative to a dovetail slot of a slice chamber of a headbox.
The device includes a curved housing having an upstream and a downstream end. The upstream end of the housing is secured within the dovetail slot.
The downstream end of the housing defines an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element.
Means are provided for securing the trailing element within the open ended slot.
In a more specific embodiment of the present invention, the housing is of stainless steel.
The upstream end of the housing defines a dovetail shaped portion which cooperates with the dovetail slot for rigidly securing the housing relative to the dovetail slot.
In an alternative embodiment to the present invention, the upstream end defines an elongate bead-shaped portion which is slideably anchored within the dovetail slot for rotatably securing the housing relative to the dovetail slot.
The open ended slot has a width which is substantially the same as the thickness of the trailing element so that the open ended slot provides an interference fit with the trailing element.
The open ended slot includes a first and a second wall. At least one of the walls defines a locking ridge which extends in a cross-machine direction. The ridge cooperates with a corresponding indentation defined by the trailing element. The arrangement is such that when the trailing element is inserted into the open ended slot, the walls flex for permitting the insertion of the trailing element. The ridge cooperates with the indentation for locking the trailing element within the open ended slot.
In an alternative embodiment of the present invention, the open ended slot includes a first and a second wall, the walls defining aligned holes. A pin extends through the aligned holes and a further hole defined by the trailing element. The arrangement is such that the pin rigidly anchors the trailing elements within the open ended slot.
More specifically, the aligned holes are elongated in a cross-machine direction in order to accommodate any expansion of the housing relative to the trailing element.
In an alternative embodiment to the present invention, the upstream end defines an elongate bead-shaped portion which is slideably anchored within the dovetail slot for rotatably securing the housing relative to the dovetail slot.
The open ended slot has a width which is substantially the same as the thickness of the trailing element so that the open ended slot provides an interference fit with the trailing element.
The open ended slot includes a first and a second wall. At least one of the walls defines a locking ridge which extends in a cross-machine direction. The ridge cooperates with a corresponding indentation defined by the trailing element. The arrangement is such that when the trailing element is inserted into the open ended slot, the walls flex for permitting the insertion of the trailing element. The ridge cooperates with the indentation for locking the trailing element within the open ended slot.
In an alternative embodiment of the present invention, the open ended slot includes a first and a second wall, the walls defining aligned holes. A pin extends through the aligned holes and a further hole defined by the trailing element. The arrangement is such that the pin rigidly anchors the trailing elements within the open ended slot.
More specifically, the aligned holes are elongated in a cross-machine direction in order to accommodate any expansion of the housing relative to the trailing element.
Many modifications and variations of the present invention will be readily apparent to those skilled in the art by a consideration of the detailed description of the preferred embodiment taken in conjunction with the annexed drawings. However, such modifications and variations fall within the spirit and scope of the present invention as defined by the appended claims.
BRIEF DESCRIPTION OF THE DRAWIN ~S
Fig. 1 is a side sectional view of a holder device according to a first embodiment of the present invention.
Fig. 2 is a side sectional view showing a further embodiment of the present invention.
Fig. 3 is a side sectional view of a third embodiment of the present invention.
Fig. 4 is a side sectional view of a fourth embodiment of the present invention.
Fig. 5 is a view taken on the line 5-5 of Fig. 4.
Similar reference characters refer to similar parts throughout the various embodiments of the present drawings.
Figs. 1-4 show various embodiments of the holder device generally designated 10 according to the present invention for holding a trailing element 12 relative to a dovetail slot 14 of a slice chamber 16 of a headbox 18.
As shown in Fig. 1, the device 10 includes a curved housing 20 having an upstream and a downstream end 22 and 24, respectively. The upstream end 22 is secured within the dovetail slot 14.
BRIEF DESCRIPTION OF THE DRAWIN ~S
Fig. 1 is a side sectional view of a holder device according to a first embodiment of the present invention.
Fig. 2 is a side sectional view showing a further embodiment of the present invention.
Fig. 3 is a side sectional view of a third embodiment of the present invention.
Fig. 4 is a side sectional view of a fourth embodiment of the present invention.
Fig. 5 is a view taken on the line 5-5 of Fig. 4.
Similar reference characters refer to similar parts throughout the various embodiments of the present drawings.
Figs. 1-4 show various embodiments of the holder device generally designated 10 according to the present invention for holding a trailing element 12 relative to a dovetail slot 14 of a slice chamber 16 of a headbox 18.
As shown in Fig. 1, the device 10 includes a curved housing 20 having an upstream and a downstream end 22 and 24, respectively. The upstream end 22 is secured within the dovetail slot 14.
The downstream end 24 of the housing 20 defines an open ended slot generally designated 26 which extends in a cross-machine direction CD
for the reception therein of the trailing element 12.
Means generally designated 28 are provided for securing the trailing element 12 within the open ended slot 26.
In a preferred embodiment to the present invention, the housing 20 is of stainless steel.
The embodiments shown in Figs. 1 and 2 show the upstream end 22 and 22a, respectively, defining a dovetail shaped portion 30 and 30a respectively which cooperate with the dovetail slots 14 and 14a for rigidly securing the housing 20 and 20a respectively, relative to the dovetail slot 14, 14a.
As shown in Fig. 3, the upstream end 22b defines an elongate bead-shaped portion 32 which is slideably anchored within the dovetail slot 14b for rotatably securing the housing 20b relative to the dovetail slot 14b.
As shown in Fig. 3, the open ended slot 26b has a width W which is substantially the same as a thickness T of the trailing element 12b so that the open ended slot 26b provides an interference fit with the trailing element. Such an arrangement is also utilized in the embodiment shown in Fig. 1.
More specifically the open ended slot 26b includes a first and a second wall 34 and 36 respectively. The wall 34 defines a locking ridge 38 which extends in the cross-machine direction. The ridge 38 cooperates with a corresponding indentation 40 defined by the trailing element 12b.
for the reception therein of the trailing element 12.
Means generally designated 28 are provided for securing the trailing element 12 within the open ended slot 26.
In a preferred embodiment to the present invention, the housing 20 is of stainless steel.
The embodiments shown in Figs. 1 and 2 show the upstream end 22 and 22a, respectively, defining a dovetail shaped portion 30 and 30a respectively which cooperate with the dovetail slots 14 and 14a for rigidly securing the housing 20 and 20a respectively, relative to the dovetail slot 14, 14a.
As shown in Fig. 3, the upstream end 22b defines an elongate bead-shaped portion 32 which is slideably anchored within the dovetail slot 14b for rotatably securing the housing 20b relative to the dovetail slot 14b.
As shown in Fig. 3, the open ended slot 26b has a width W which is substantially the same as a thickness T of the trailing element 12b so that the open ended slot 26b provides an interference fit with the trailing element. Such an arrangement is also utilized in the embodiment shown in Fig. 1.
More specifically the open ended slot 26b includes a first and a second wall 34 and 36 respectively. The wall 34 defines a locking ridge 38 which extends in the cross-machine direction. The ridge 38 cooperates with a corresponding indentation 40 defined by the trailing element 12b.
The arrangement is such that when the trailing element 12b is inserted into the open ended slot 26b as shown in both of the embodiments of Figs. 1 and 3, the walls 34 and 36 flex relative to each other for permitting insertion therein of the trailing element 12b. The ridge 38 cooperates with the indentation 40 for locking the trailing element 12b within the open ended slot 26b.
Fig. 2 shows an alternative arrangement for securing the upstream end of the trailing element 12a within the open ended slot 26a. Such an arrangement includes the provision of a first and a second wall 34a and 36a. The walls 34a, 36a define aligned holes 42 and 44. A pin 46 extends through the aligned holes 42 and 44 and a further hole 48 defined by the trailing element 12a. The arrangement is such that the pin 46 rigidly anchors the trailing element 12a within the open ended slot 26a.
Fig. 4 shows a similar arrangement to that utilized in the Fig. 2 embodiment for securing the upstream end of the trailing element 12c within the open ended slot 26c.
Fig. 5 is a view taken on the line 5-5 of Fig. 4 and shows the aligned hole 44c is elongated in the cross-machine direction CD in order to accommodate any expansion of the housing 20c in a cross-machine direction CD relative to the trailing element 12c.
The present invention provides a unique means for securing an upstream end of a trailing element within a slice chamber of the headbox while avoiding the use of any bonding solvents.
Fig. 2 shows an alternative arrangement for securing the upstream end of the trailing element 12a within the open ended slot 26a. Such an arrangement includes the provision of a first and a second wall 34a and 36a. The walls 34a, 36a define aligned holes 42 and 44. A pin 46 extends through the aligned holes 42 and 44 and a further hole 48 defined by the trailing element 12a. The arrangement is such that the pin 46 rigidly anchors the trailing element 12a within the open ended slot 26a.
Fig. 4 shows a similar arrangement to that utilized in the Fig. 2 embodiment for securing the upstream end of the trailing element 12c within the open ended slot 26c.
Fig. 5 is a view taken on the line 5-5 of Fig. 4 and shows the aligned hole 44c is elongated in the cross-machine direction CD in order to accommodate any expansion of the housing 20c in a cross-machine direction CD relative to the trailing element 12c.
The present invention provides a unique means for securing an upstream end of a trailing element within a slice chamber of the headbox while avoiding the use of any bonding solvents.
Claims (10)
1. A holder device for holding a trailing element relative to a dovetail slot of a slice chamber of a headbox, said device comprising:
a curved housing having an upstream and a downstream end, said upstream end being secured within the dovetail slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element; and means for securing the trailing element within said open ended slot.
a curved housing having an upstream and a downstream end, said upstream end being secured within the dovetail slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element; and means for securing the trailing element within said open ended slot.
2. A holder device as set forth in claim 1 wherein:
said housing is of stainless steal.
said housing is of stainless steal.
3. A holder device as set forth in claim 1 wherein:
said upstream end defines a dovetail shaped portion which cooperates with said dovetail slot for rigidly securing said housing relative to the dovetail slot.
said upstream end defines a dovetail shaped portion which cooperates with said dovetail slot for rigidly securing said housing relative to the dovetail slot.
4. A holder device as set forth in claim 1 wherein:
said upstream end defines an elongate bead shaped portion which is slideably anchored within said dovetail slot for rotatably securing said housing relative to the dovetail slot.
said upstream end defines an elongate bead shaped portion which is slideably anchored within said dovetail slot for rotatably securing said housing relative to the dovetail slot.
5. A holder device as set forth in claim 1 wherein:
said open ended slot has a width which is substantially the same as a thickness of the trailing element so that said open ended slot provides an interference fit with the tailing element.
said open ended slot has a width which is substantially the same as a thickness of the trailing element so that said open ended slot provides an interference fit with the tailing element.
6. A holder device as set forth in claim 1 wherein:
said open ended slot includes:
a first and a second wall;
at least one of said walls defining a locking ridge extending in a cross-machine direction, said ridge cooperating with a corresponding indentation defined by the trailing element, the arrangement being such that when the trailing element is inserted into said open ended slot, said walls flex for permitting insertion of the trailing element, said ridge cooperating with said indentation for locking the trailing element within said open ended slot.
said open ended slot includes:
a first and a second wall;
at least one of said walls defining a locking ridge extending in a cross-machine direction, said ridge cooperating with a corresponding indentation defined by the trailing element, the arrangement being such that when the trailing element is inserted into said open ended slot, said walls flex for permitting insertion of the trailing element, said ridge cooperating with said indentation for locking the trailing element within said open ended slot.
7. A holder device as set forth in claim 7 wherein:
said open ended slot includes:
a first and a second wall, said walls defining aligned holes;
a pin extending through said aligned holes and a further hole defined by the trailing element, the arrangement being such that said pin rigidly anchors the trailing element within said open ended slot.
said open ended slot includes:
a first and a second wall, said walls defining aligned holes;
a pin extending through said aligned holes and a further hole defined by the trailing element, the arrangement being such that said pin rigidly anchors the trailing element within said open ended slot.
8. A holder device as set forth in claim 7 wherein:
said aligned holes are elongated in a cross-machine direction in order to accommodate any expansion in said housing relative to the trailing element.
said aligned holes are elongated in a cross-machine direction in order to accommodate any expansion in said housing relative to the trailing element.
9. A holder device for holding a trailing element relative to a slot of a slice chamber of a headbox, said device comprising:
a curved housing having upstream and a downstream end, said upstream end being secured within the slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element;
means for securing the trailing element within said open ended slot;
said open ended slot including:
a first and a second wall; and at least one of said walls defining a locking ridge extending in a cross-machine direction, said ridge cooperating with a corresponding indentation defined by the trailing element, the arrangement being such that when the trailing element is inserted into said open slot, said walls flex relative to each other for permitting insertion of the trailing element into said open ended slot, said ridge cooperating with said indentation for locking the trailing element within said open ended slot.
a curved housing having upstream and a downstream end, said upstream end being secured within the slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element;
means for securing the trailing element within said open ended slot;
said open ended slot including:
a first and a second wall; and at least one of said walls defining a locking ridge extending in a cross-machine direction, said ridge cooperating with a corresponding indentation defined by the trailing element, the arrangement being such that when the trailing element is inserted into said open slot, said walls flex relative to each other for permitting insertion of the trailing element into said open ended slot, said ridge cooperating with said indentation for locking the trailing element within said open ended slot.
10. A holder device for holding a trailing element relative to a dovetail slot for slice chamber of the headbox, said device comprising:
a stainless steel curved housing having an upstream and a downstream end, said upstream end being secured within the dovetail slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element;
means for securing the trailing element within said open ended slot;
said upstream end of said housing defining an elongate bead-shaped portion which is slideably anchored within said dovetail slot for rotatably securing said housing relative to the dovetail slot;
said open ended slot including:
a first and a second wall, said walls defining aligned holes; and a pin extending through said aligned holes and a further hole defined by the trailing element, the arrangement being such that said pin rigidly anchors the trailing element within said open ended slot.
a stainless steel curved housing having an upstream and a downstream end, said upstream end being secured within the dovetail slot;
said downstream end of said housing defining an open ended slot which extends in a cross-machine direction for the reception therein of the trailing element;
means for securing the trailing element within said open ended slot;
said upstream end of said housing defining an elongate bead-shaped portion which is slideably anchored within said dovetail slot for rotatably securing said housing relative to the dovetail slot;
said open ended slot including:
a first and a second wall, said walls defining aligned holes; and a pin extending through said aligned holes and a further hole defined by the trailing element, the arrangement being such that said pin rigidly anchors the trailing element within said open ended slot.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US85361097A | 1997-05-09 | 1997-05-09 | |
| US08/853,610 | 1997-05-09 | ||
| PCT/US1998/005267 WO1998050625A1 (en) | 1997-05-09 | 1998-03-18 | A holder device for holding a trailing element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2325878A1 true CA2325878A1 (en) | 1998-11-12 |
Family
ID=25316502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002325878A Abandoned CA2325878A1 (en) | 1997-05-09 | 1998-03-18 | A holder device for holding a trailing element |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2325878A1 (en) |
| WO (1) | WO1998050625A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6521095B1 (en) | 2002-02-05 | 2003-02-18 | Metso Paper, Inc. | Composite vane hinge in a headbox |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19930592A1 (en) | 1999-07-02 | 2001-01-11 | Voith Paper Patent Gmbh | Headbox |
| CA2408555A1 (en) * | 2000-05-10 | 2001-11-15 | Metso Paper Karlstad Ab | Headbox and arrangement and method for mounting a vane thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3888729A (en) * | 1972-11-06 | 1975-06-10 | Joseph D Parker | Papermaking machine headbox slice chamber containing pivotable thin rigid plates with flexible elements attached thereto |
| US4133715A (en) * | 1977-03-29 | 1979-01-09 | Beloit Corporation | Headbox and holders for floating slice chamber dividers |
| EP0071118B1 (en) * | 1981-07-31 | 1986-03-12 | Mitsubishi Jukogyo Kabushiki Kaisha | A flow rectifier |
| SE501798C2 (en) * | 1993-09-13 | 1995-05-15 | Valmet Karlstad Ab | Multilayer headbox |
-
1998
- 1998-03-18 WO PCT/US1998/005267 patent/WO1998050625A1/en active Application Filing
- 1998-03-18 CA CA002325878A patent/CA2325878A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6521095B1 (en) | 2002-02-05 | 2003-02-18 | Metso Paper, Inc. | Composite vane hinge in a headbox |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1998050625A1 (en) | 1998-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |