US3682260A - Rotary percussive drill and method - Google Patents

Rotary percussive drill and method Download PDF

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Publication number
US3682260A
US3682260A US3682260DA US3682260A US 3682260 A US3682260 A US 3682260A US 3682260D A US3682260D A US 3682260DA US 3682260 A US3682260 A US 3682260A
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Prior art keywords
drill bit
inner
outer
percussion member
drill
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Expired - Lifetime
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Gunter Klemm
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GUNTER KLEMM
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GUNTER KLEMM
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/002Drilling with diversely driven shafts extending into the borehole
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/64Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00Drives used in the borehole
    • E21B4/06Down-hole impacting means, e.g. hammers
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/20Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Abstract

A rotary percussive drill has relatively movable inner and outer concentric drill pipes and a down-the-hole hammer that acts on the inner pipe near the cutting bits. The impact of the hammer is transmitted by an external shoulder on the inner drill to an internal shoulder on the inner drill to an internal shoulder on the outer drill adjacent the bits.

Description

United States Patent Klemm [451 Aug. 8, 1972 [54] ROTARY PERCUSSIVE DRILL AND 2,947,519l 8/ 1960 Feucht ..1'75/296 X METHOD 1,391,344 9/ 1921 Rotino` ..175/23 1,861,042 l 5/ 1932 Zublin ..175/296 X [72] Invent ggl'khodmeme/Bigge Glfrndtfym 2,877,984 3/1959 causey ..175/389 x 3,227,230 1/ 1966 Lagerstrom ..175/257 X [22] Filed: May 28, 1970 3,370,658 2/ 1968 Jansson ..175/390 X [21] APPL No# 41,170 FOREIGN PATENTS 0R APPucAnoNs [30] Freign AP I, tion Data 1,068,638 5/ 1967 Great Britain ..175/305 May 3o, 1969 Germany P 19 27 672.3 Primary Examiner-James A- Leppink Jan- 3l, 1970 Germany P 20 O4 459,1 AHOmey-YOUng & Thompson [52] U.s. cl. ..175/92, 175/257, 175/386 [5 7] ABSTRACT [51] Int. Cl. ..E2lb 5/00 A to tary percussrve dnll has relatively movable inner [58] and outer concentric drill pipes and a down-the-hole 386 389 396 hammer that acts on 'the inner pipe near the cutting bits. The impact of the hammer is transmitted by an external shoulder on the inner drill to an internal [56] Referenc cned shoulder on the inner drill to an internal shoulder on UNITED STATES PATENTS the outer drill adjacent the bits.

2,873,093 2/ 1959 Hildebrandt et al. ..175/296 X 4 Claims, 5 Drawing Figures PATENTEDnus 81912 3,682,250 SHEET l F 2 I /A/VfA/rme ROTARY PERCUSSIVE DRILL AND METHOD The present invention relates to rotary earth drills such as those for penetrating overburden and the like, and is of particular application to rotary percussive drills having relatively movable inner and outer drill pipes.

Known drilling apparatus of this type suffers from the disadvantage that the inner and outer cutters cannot be simultaneously and equally loaded by a percussion hammer. Down-the-hole hammers of types known heretofore act only on the inner drill bit of the inner drill pipe, which thus tends to lead the outer drill pipe. Loading the outer drill pipe by means of a percussion hammer disposed above ground has the disadvantage that the impacts must be transmitted over the entire length of the outer drill pipe, so that relatively little energy from the blows is usefully applied to the outer drill bit.

lt is accordingly an object of the present invention to improve the efficiency of drilling apparatus of the present type by the simultaneous and uniform loading of the inner and outer drill bits by means of a down-thehole percussion hammer.

Another object of the present invention is the provision of drilling apparatus which is readily adapted to be modified so as to function not only in loose soil or overburden, but also in hard rock, and to provide methods for carrying out the corresponding drilling operations.

Finally, it is an object of the present invention to provide apparatus as described above, which will be relatively simple and inexpensive to manufacture, easy to operate, and rugged and durable in use.

Briefly, the present invention achieves these objects by providing a percussion member which is disposed between the down-the-hole hammer and the internal drill bit, the percussion member providing radially outwardly extending downwardly facing percussion shoulders which bear on radially inwardly extending upwardly facing percussion shoulders on the outer drill bit. The percussive blows are thus transmitted both to the inner and to the outer drill bits. This percussion member is screw-threadedly attached to the inner drill bit. The inner drill pipe transmits air or water that passes through ports in the inner drill bit to flush away the cuttings, which are transmitted back up through channels in the inner bit and percussion member.

The inner and outer drills rotate and advance together through overburden or other relatively loose ground formations. When solid rock is encountered, however, the inner drill is replaced with one that has no percussion member and that passes downwardly through the outer drill to fonn a bore hole, while the outer drill is held stationary.

Other objects, features and advantages of the present invention will become apparent from a consideration of the following description, taken in connection with the accompanying drawings, in which:

FIG. 1 is a fragmentary elevational view, partly in cross section, of the lower part of drilling apparatus according to the present invention;

FIG. 2 is a bottom plan view of the structure shown in FIG. 1;

FIG. 3 is an enlarged fragmentary cross-sectional view of the outer drill bit of the present invention;

FIG. 4 is an exploded elevational view of the percussion member and inner drill bit of the present invention; and

FIG. 5 is a bottom plan view of the structure shown in FIG. 4.

Referring now to the drawings in greater detail, there is shown drilling apparatus according to the present invention, comprising an outer drill pipe l, an inner drill pipe 2, an annular outer drill bit 3, an inner drill bit 4, and a conventional down-the-hole hammer 5. Outer drill bit 3 is screw-threadedly connected to outer drill pipe 1 at 6. Hammer 5 is disposed at the lower end of inner drill pipe 2. A percussion member 7 is secured to hammer 5 in non-rotatable relation thereto but has limited axial sliding movement relative to hammer 5.

Referring now to FIG. 4, the percussion member 7 is shown there in greater detail as having a splined shank 8 insertable in hammer 5, shank 8 having a flat 9 thereon; and at its lower end, member 7 has an externally screw-threaded shank l0 receivable in a correspondingly screw-threaded recess in inner drill bit 4.

Percussion member 7 has radially outwardly extending shoulder means adjacent its lower end, that terminate downwardly in downwardly facing percussion shoulders l1. Shoulders l1 rest on and are adapted to strike corresponding upwardly facing radially inwardly extending shoulders 12 on drill bit 3. Shoulders l2 may be continuous or spaced apart about a circle.

Inner drill bit 4 has several ports 13 for air or water V for flushing away cuttings. Ports 13 communicate with a continuous axial bore 14 that extends through percussion member 7 and up through the inner drill pipe. Circumferentially spaced vertical recesses 15 about the outer edges of percussion member 7 provide return passageways for the flushing fluid and are in alignment with corresponding recesses on drill bit 4 when screwthreaded shank l0 is tightened into drill bit 4. The flushing material then passes upwardly in the usual manner between the inner and outer drill pipes. This return passageway also provides a discharge passageway for the working medium discharged from hammer 5.

During penetration of the soil or overburden, outer and inner pipes l and 2 are rotated together by conventional rotary power means (not shown) while being simultaneously loaded by hammer 5 whose impacts are transmitted not only to drill bit 4 but by the novel structure just recited also to drill bit 3. The path of transmission of the blows is thus as short as possible.

When hard rock is reached, the inner drill pipe 2 with hammer 5 and percussion member 7 and inner drill bit 4 is withdrawn upwardly and outer drill pipe l is left in place to support the loose soil or rock but is not rotated. There is then inserted an internal drilling cutter (not shown) which passes through the internal aperture 20 of outer drill bit 3, only this replacement inner cutter being driven downwardly by rotation and percussion through the rock, Outer drill pipe 1 remains stationary and the replacement cutter passes downwardly therethrough because it includes no percussion member 7 and because its outer diameter, including the outer diameter of hammer 5, is less than the internal diameter of aperture 20. The inner or replacement cutter can then be withdrawn to enable the bore hole thus formed to be employed for its intended purpose, such as blasting or the like.

After the rock has been traversed, then drilling with the assembly shown in the drawings can be resumed.

From a consideration of the foregoing disclosure, therefore, it will be evident that all of the initially recited objects of the present invention have been achieved.

Although the present invention has been described and illustrated in connection with a preferred embodiment, it is to be understood that modifications and variations may be resorted to without departing from the spirit of the invention, as those skilled in this art will readily understand. Such modificationsand variations are considered to be within the purview and scope of the present invention as defined by the appended claims.

Having described my invention, I claim:

l. A drillingapparatus comprising an outer drill pipe having an outer drill, an inner drill pipe having an inner drill bit and a down-the-hole hammer to transmit percussive vshocks to said inner drill bit, and a percussion member disposed between said hammer and said inner drill bit, said percussion member having portions thereof striking said outer drill bit thereby to transmit percussive shocks also to said outer drill bit, said hammer having an external diameter which is smaller than the least internal diameter of said outer pipe and outer drill bit, thus enabling said inner drill bit to be replaced with another inner drill bit of an outside diameter smaller than the inside diameter of said outer drill pipe and bit to penetrate hard formations with said first drill pipe and said another inner drill bit while maintaining said outer drill pipe and bit stationary.

2. Apparatus as claimed in claim l, said portions of said percussion member comprising downwardly facing radially outwardly extending shoulder means on said percussion member overlying and contacting upwardly facing radially inwardly extending shoulder means on said outer drill bit.

3. Apparatus as claimed in claim l, and a screwthreaded connection between said inner drill bit and said percussion member whereby said inner drill bit and percussion member are detachably interconnected.

4. Apparatus as claimed in claim l, said inner drill bit having a plurality of pons therethrough for the passage of fluid for flushing cuttings from the drill face, said percussion member having an axial bore therethrough that communicates with said ports.

* Ik Ik

Claims (4)

1. A drilling apparatus comprising an outer drill pipe having an outer drill, an inner drill pipe having an inner drill bit and a down-the-hole hammer to transmit percussive shocks to said inner drill bit, and a percussion member disposed between said hammer and said inner drill bit, said percussion member having portions thereof striking said outer drill bit thereby to transmit percussive shocks also to said outer drill bit, said hammer having an external diameter which is smaller than the least internal diameter of said outer pipe and outer drill bit, thus enabling said inner drill bit to be replaced with another inner drill bit of an outside diameter smaller than the inside diameter of said outer drill pipe and bit to penetrate hard formations with said first drill pipe and said another inner drill bit while maintaining said outer drill pipe and bit stationary.
2. Apparatus as claimed in claim 1, said portions of said percussion member comprising downwardly facing radially outwardly extending shoulder means on said percussion member overlying and contacting upwardly facing radially inwardly extending shoulder means on said outer drill bit.
3. Apparatus as claimed in claim 1, and a screw-threaded connection between said inner drill bit and said percussion member whereby said inner drill bit and percussion member are detachably interconnected.
4. Apparatus as claimed in claim 1, said inner drill bit having a plurality of ports therethrough for the passage of fluid for flushing cuttings from the drill face, said percussion member having an axial bore therethrough that communicates with said ports.
US3682260A 1969-05-30 1970-05-28 Rotary percussive drill and method Expired - Lifetime US3682260A (en)

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DE19691927672 DE1927672C3 (en) 1969-05-30 1969-05-30
DE19702004459 DE2004459A1 (en) 1970-01-31 1970-01-31

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BE (1) BE750586A (en)
ES (1) ES380161A1 (en)
FR (1) FR2049135B1 (en)
GB (1) GB1257429A (en)
NL (1) NL7007598A (en)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835943A (en) * 1972-02-25 1974-09-17 R Bray Drilling apparatus and adaptor assembly for such apparatus
US3854539A (en) * 1972-08-23 1974-12-17 Tigre Tierra Drilling apparatus with down hole motor
US3870114A (en) * 1973-07-23 1975-03-11 Stabilator Ab Drilling apparatus especially for ground drilling
US3874464A (en) * 1972-08-23 1975-04-01 Tigre Tierra Processing of drilling an earth formation
US3893524A (en) * 1972-08-23 1975-07-08 Tigre Tierra Rotary drill rod
US3903975A (en) * 1972-08-23 1975-09-09 Tigre Tierra Drilling apparatus with down-the-hole motor
US3933209A (en) * 1972-08-23 1976-01-20 Tigre Tierra, Inc. Drilling apparatus and technique using down-hole motor
US3945444A (en) * 1975-04-01 1976-03-23 The Anaconda Company Split bit casing drill
US3990524A (en) * 1974-06-03 1976-11-09 Tigre Tierra, Inc. Down-the-hole motor for rotary drill rod and process for drilling using the same
US4002213A (en) * 1974-03-01 1977-01-11 Tigre Tierra, Inc. Down-the-hole motor for rotary drill rod and process for drilling using the same
US4183415A (en) * 1977-11-21 1980-01-15 Stenuick France Drilling apparatus
US4196783A (en) * 1978-07-11 1980-04-08 Lofs Verkstads Ab Device for boring
US4296821A (en) * 1980-02-07 1981-10-27 Leslie Larson Drilling rig and conversion apparatus
US4408669A (en) * 1977-04-29 1983-10-11 Sandvik Aktiebolag Means for drilling
US4415047A (en) * 1980-11-24 1983-11-15 Adcock Gerald L Downhole case driving apparatus for impact drills
US4852672A (en) * 1988-08-15 1989-08-01 Behrens Robert N Drill apparatus having a primary drill and a pilot drill
US4979848A (en) * 1988-11-03 1990-12-25 Gerhard Sauer Drilling device
WO1993009328A1 (en) * 1991-11-08 1993-05-13 Renfer, Heinz Drilling process and device
WO1994024405A1 (en) * 1993-04-08 1994-10-27 Sandvik Ab Down-hole hammer drill having reverse circulation and drill bit for the hammer drill
US5503224A (en) * 1994-06-28 1996-04-02 Big Iron Drilling Ltd. Casing drive apparatus
EP0843073A1 (en) * 1996-11-13 1998-05-20 Gerhard Dr.-Ing. Sauer Method and device for setting injection anchoring bolts
WO1998021439A1 (en) * 1996-11-12 1998-05-22 Techmo Entwicklungs- Und Vertriebs Gmbh Process and device for simultaneously drilling and lining a hole
US5839519A (en) * 1996-11-08 1998-11-24 Sandvik Ab Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment
US6106200A (en) * 1996-11-12 2000-08-22 Techmo Entwicklungs-Und Vertriebs Gmbh Process and device for simultaneously drilling and lining a hole
EP1127477A1 (en) * 1998-11-04 2001-08-29 Numa Tool Company Method and device in down-the-hole drilling
US6675919B2 (en) * 2000-02-04 2004-01-13 Frank's Casing Crew And Rental Tools, Inc. Tubular piling apparatus and method
US20060021801A1 (en) * 2004-02-17 2006-02-02 John Hughes Retrievable center bit
US20090101413A1 (en) * 2005-06-10 2009-04-23 Geomechanik Wasser-Und Umwelttechnik Gmbh DTH-hammer drilling device and overburden drilling method
US20100193250A1 (en) * 2009-01-30 2010-08-05 Tesco Corporation Cutting Structure for Casing Drilling Underreamer
US20110198129A1 (en) * 2008-10-13 2011-08-18 Oy Atlas Copco Rotex Ab Method and drilling apparatus for down-the-hole drilling
WO2017007469A1 (en) * 2015-07-08 2017-01-12 Halliburton Energy Services Inc. Downhole mechanical percussive hammer drill assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2924392C2 (en) * 1979-06-16 1982-09-23 Ing. Guenter Klemm, Spezialunternehmen Fuer Bohrtechnik, 5962 Drolshagen, De
FR1094604A (en) * 1982-03-10 1955-05-23

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1391344A (en) * 1921-06-17 1921-09-20 Rotinoff Alexande Georgievitch Pile-driving apparatus
US1861042A (en) * 1930-04-28 1932-05-31 John A Zublin Rotary bit with hammering device
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US2877984A (en) * 1954-07-26 1959-03-17 Otis A Causey Apparatus for well drilling
US2947519A (en) * 1957-09-11 1960-08-02 Westinghouse Air Brake Co Percussion drill
US3227230A (en) * 1961-02-21 1966-01-04 Atlas Copco Ab Combination ring and central drill bit drilling equipment
GB1068638A (en) * 1963-09-11 1967-05-10 Johnson Construction Co Ab Drilling equipment
US3370658A (en) * 1964-08-11 1968-02-27 Bengt K.B. Jansson Drill and tube arrangement with knock-of drill portion

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1391344A (en) * 1921-06-17 1921-09-20 Rotinoff Alexande Georgievitch Pile-driving apparatus
US1861042A (en) * 1930-04-28 1932-05-31 John A Zublin Rotary bit with hammering device
US2877984A (en) * 1954-07-26 1959-03-17 Otis A Causey Apparatus for well drilling
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US2947519A (en) * 1957-09-11 1960-08-02 Westinghouse Air Brake Co Percussion drill
US3227230A (en) * 1961-02-21 1966-01-04 Atlas Copco Ab Combination ring and central drill bit drilling equipment
GB1068638A (en) * 1963-09-11 1967-05-10 Johnson Construction Co Ab Drilling equipment
US3370658A (en) * 1964-08-11 1968-02-27 Bengt K.B. Jansson Drill and tube arrangement with knock-of drill portion

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835943A (en) * 1972-02-25 1974-09-17 R Bray Drilling apparatus and adaptor assembly for such apparatus
US3854539A (en) * 1972-08-23 1974-12-17 Tigre Tierra Drilling apparatus with down hole motor
US3874464A (en) * 1972-08-23 1975-04-01 Tigre Tierra Processing of drilling an earth formation
US3893524A (en) * 1972-08-23 1975-07-08 Tigre Tierra Rotary drill rod
US3903975A (en) * 1972-08-23 1975-09-09 Tigre Tierra Drilling apparatus with down-the-hole motor
US3933209A (en) * 1972-08-23 1976-01-20 Tigre Tierra, Inc. Drilling apparatus and technique using down-hole motor
US3870114A (en) * 1973-07-23 1975-03-11 Stabilator Ab Drilling apparatus especially for ground drilling
US4002213A (en) * 1974-03-01 1977-01-11 Tigre Tierra, Inc. Down-the-hole motor for rotary drill rod and process for drilling using the same
US3990524A (en) * 1974-06-03 1976-11-09 Tigre Tierra, Inc. Down-the-hole motor for rotary drill rod and process for drilling using the same
US3945444A (en) * 1975-04-01 1976-03-23 The Anaconda Company Split bit casing drill
US4408669A (en) * 1977-04-29 1983-10-11 Sandvik Aktiebolag Means for drilling
US4545443A (en) * 1977-04-29 1985-10-08 Sandvik Aktiebolag Means for drilling
US4183415A (en) * 1977-11-21 1980-01-15 Stenuick France Drilling apparatus
US4196783A (en) * 1978-07-11 1980-04-08 Lofs Verkstads Ab Device for boring
US4296821A (en) * 1980-02-07 1981-10-27 Leslie Larson Drilling rig and conversion apparatus
US4415047A (en) * 1980-11-24 1983-11-15 Adcock Gerald L Downhole case driving apparatus for impact drills
US4852672A (en) * 1988-08-15 1989-08-01 Behrens Robert N Drill apparatus having a primary drill and a pilot drill
US4979848A (en) * 1988-11-03 1990-12-25 Gerhard Sauer Drilling device
US5355966A (en) * 1991-11-08 1994-10-18 Mathis Andrea L Drilling method and an assembly for performing the method
WO1993009328A1 (en) * 1991-11-08 1993-05-13 Renfer, Heinz Drilling process and device
CN1036019C (en) * 1992-12-03 1997-10-01 约尔马·耶尔韦拉 Drilling apparatus
WO1994024405A1 (en) * 1993-04-08 1994-10-27 Sandvik Ab Down-hole hammer drill having reverse circulation and drill bit for the hammer drill
US5503224A (en) * 1994-06-28 1996-04-02 Big Iron Drilling Ltd. Casing drive apparatus
US5839519A (en) * 1996-11-08 1998-11-24 Sandvik Ab Methods and apparatus for attaching a casing to a drill bit in overburden drilling equipment
WO1998021439A1 (en) * 1996-11-12 1998-05-22 Techmo Entwicklungs- Und Vertriebs Gmbh Process and device for simultaneously drilling and lining a hole
US6106200A (en) * 1996-11-12 2000-08-22 Techmo Entwicklungs-Und Vertriebs Gmbh Process and device for simultaneously drilling and lining a hole
EP0843073A1 (en) * 1996-11-13 1998-05-20 Gerhard Dr.-Ing. Sauer Method and device for setting injection anchoring bolts
EP1127477A1 (en) * 1998-11-04 2001-08-29 Numa Tool Company Method and device in down-the-hole drilling
EP1127477A4 (en) * 1998-11-04 2002-10-09 Numa Tool Co Method and device in down-the-hole drilling
US6675919B2 (en) * 2000-02-04 2004-01-13 Frank's Casing Crew And Rental Tools, Inc. Tubular piling apparatus and method
US20060021801A1 (en) * 2004-02-17 2006-02-02 John Hughes Retrievable center bit
US7520343B2 (en) * 2004-02-17 2009-04-21 Tesco Corporation Retrievable center bit
US20090101413A1 (en) * 2005-06-10 2009-04-23 Geomechanik Wasser-Und Umwelttechnik Gmbh DTH-hammer drilling device and overburden drilling method
US20110198129A1 (en) * 2008-10-13 2011-08-18 Oy Atlas Copco Rotex Ab Method and drilling apparatus for down-the-hole drilling
US20100193250A1 (en) * 2009-01-30 2010-08-05 Tesco Corporation Cutting Structure for Casing Drilling Underreamer
WO2017007469A1 (en) * 2015-07-08 2017-01-12 Halliburton Energy Services Inc. Downhole mechanical percussive hammer drill assembly
GB2555299A (en) * 2015-07-08 2018-04-25 Halliburton Energy Services Inc Downhole mechanical percussive hammer drill assembly

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Publication number Publication date Type
FR2049135A1 (en) 1971-03-26 application
ES380161A1 (en) 1973-02-16 application
BE750586A (en) 1970-11-03 grant
FR2049135B1 (en) 1974-03-15 grant
BE750586A1 (en) grant
GB1257429A (en) 1971-12-15 application
NL7007598A (en) 1970-12-02 application

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