US3813101A - Pickup needle - Google Patents
Pickup needle Download PDFInfo
- Publication number
- US3813101A US3813101A US00249687A US24968772A US3813101A US 3813101 A US3813101 A US 3813101A US 00249687 A US00249687 A US 00249687A US 24968772 A US24968772 A US 24968772A US 3813101 A US3813101 A US 3813101A
- Authority
- US
- United States
- Prior art keywords
- shaft
- pickup
- needle
- pickup needle
- tip
- 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
- 239000010453 quartz Substances 0.000 claims abstract description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010431 corundum Substances 0.000 claims abstract description 7
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 7
- 229910052594 sapphire Inorganic materials 0.000 claims description 5
- 239000010980 sapphire Substances 0.000 claims description 5
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 abstract description 20
- 229910003460 diamond Inorganic materials 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 15
- 229910000679 solder Inorganic materials 0.000 abstract description 6
- 239000011521 glass Substances 0.000 abstract description 5
- 229910010271 silicon carbide Inorganic materials 0.000 abstract description 5
- 229910052580 B4C Inorganic materials 0.000 abstract description 4
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 238000003754 machining Methods 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
- G11B3/44—Styli, e.g. sapphire, diamond
- G11B3/46—Constructions or forms ; Dispositions or mountings, e.g. attachment of point to shank
Definitions
- the present invention relates to a new and improved pickup needle having a diamond tip soldered by means of a hard solder to a shaft.
- the tip is formed of diamond, since this material offers suffi cient wear resistance in order to be able to ensure satisfactory sound pickup over a longer period of time, and therefore playback at microgrooved-long playing records, especially stereo records.
- needles of this type are those where the shaft is formedof metal, for instance, aluminum, steel -or molybdenum.
- Such type pickup needles have been disclosed, for instance, in the following publications: German patent publication 1,552,160, Swiss patent 377,119, British patent 836,768, Dutch patent application 6l/268,734, Dutch patent, 101,167 and U.S. Pat. Nos. 2,961,750, 2,570,248 and 2,960,759.
- the diamond tip is flanged-in or soldered.
- One of the drawbacks of such needles is theirrelatively great 'weight which is essentially ascribed .tothe shaft.
- the specific weight of such needles is in the order of magnitude of approximately 7.9 gmslcm tsteel) and l 1.0 gms/cm (molybdenum). Even if the dimensions of the needles are verysmall their weight hasa measurable influence upon theinertia of the sound pickupsystem, which is noticeable during pickup of-high frequencies in the region beginning approximately at l2-kHz.
- German patent publication l,l80, l 56 pickup needles ground of one-piece from diamond While such possess a low specific weight of 3.4 gms/cm they are however extremely expensive as concerns the raw material and machining.
- Yet afurther significant object of the present invention relates to an improved construction of pickup needle having a diamond tip and a shaft formed of a material which imparts increased lightweight characteristics to the needle while improving upon the sound pickup characteristics thereof, especially at high frequencies.
- the proposed pickup needle of this development is manifested by the features that the shaft is formed of a material selected from silicon carbide, boron carbide, corundum, quartz and glass having a melting point exceeding 800C.
- the shaft material monocrystalline corundum, for instance ruby or sapphire, preferably synthetic colorless sapphire.
- This material possesses increased hardness and mechanical as well as chemical resistance and is extremely' well suited for subsequent mounting of the needle at the needle support.
- shaft material is glass, having a meltingpoint exceeding 800C., that is, SiO and A1 0 containing glass.
- glass having a meltingpoint exceeding 800C., that is, SiO and A1 0 containing glass.
- shaft material is quartz, especially monocyrstalline quartz, and silicon carbide, especially monocrystalline silicon carbide.
- FIG. 1 is an exploded view of the components of a pickup needle designed according to the teachings of the present invention prior to final machining;
- FIG. 2 schematically illustrates a finished machined pickup needle produced according to the teachings of this invention.
- FIG. 1 there is shown a blank 1 of a cylindrical shaft, formed of any of the materials heretofore disclosed, and which is provided at its upper end face with a slight depression or recess 2.
- Reference numeral 3 designates a layer of a hard solder and reference character 4 a raw or semi-finished diamond grain.
- Soldering of the diamond grain 4 to the blank shaft 1 can be performed, for instance, by way of example but not exclusively, according to the techniques described in U.S. Pat. No. 2,570,248, so that no further discussion thereof would appear to be necessary.
- the blank shaft 1 possesses a diameter which is in the order of 0.6 and 1.0 mm. and in its raw or blank state its length, similar to the known pickup needles formed completely of sapphire, is in the order of 0.8 and 1.6 mm.
- the selection of such dimensions depends to a large degree upon the machining means used for grinding the tip.
- the finished machine tip has been illustrated in FIG. 2. it will be recognized that the blank shaft 1 of FIG. 1 is slightly conically pointed at its end carrying the diamond grain 4 and therefore has now become the needle shaft 1'. Similarly, the hard solder layer is apparent and has been designated by reference character 3' whereas the diamond grain 4 has been essentially ground into a cone 4' having a rounded tip 5 and further possesses a highly polished outer surface at least at the region of tip 5. The degree of finishing or machining of the pickup needle depicted in FIG.
- 2 corresponds to the needles employed in commercially available pickups, that is to say, possess a diameter in the order of magnitude between 0.4 and 0.8 mm., a length in the order of magnitude of 0.8 to 1.2 mm., a cone angle of the tip in the order of magnitude of 40 to 60, a radius of curvature of the tip in the order of magnitude of 0.012 to 0.025 mm (for long playing records).
- bi-radial tip that is, a tip the cone of which at least at the region of the rounded portion of the tip possesses an elliptical outline so that the rounded portion of the tip in two axial cutting planes perpendicular to one another possesses a respective minimum value of for instance 0.012 mm. and a maximum value of for instance 0.025 mm.
- the described pickup needle is just as nonsensitive to corrosion effects of all types, such as those caused by humidity, smoke, human perspiration, anti-static agents, and so forth, as pure diamond needies, yet in contrast to such is a number of times cheaper.
- the pickup needle advantageously possesses a lower specific weight, which preferably amounts to about 4.00 gm/cm or less, depending upon the specific material selected for the shaft.
- a pickup needle comprising a non-metallic shaft, a diamond tip, and a hard solder layer therebetween bonding the diamond tip to such nonmetallic shaft, said non-metallic shaft being formed of a material selectedfrom the group consisting of silicon carbide, boron carbide, corundum, and quartz.
Abstract
A pickup needle having a diamond tip soldered by a hard solder to a shaft. According to the invention the shaft is formed of a material selected from silicon carbide, boron carbide, corundum, quartz and glass having a melting point exceeding 800*C.
Description
United States Patent 1191 Benz [ PICKUP NEEDLE [76] lnventor: Ernst Benz, Altweg 308. 7450 I Andelfingen, Switzerland [22] Filed: May 1, 1972 [21] Appl. No.: 249,687
[30] Foreign Application Priority Data June 12. 1971 Switzerland 8605/71 [52] US. CIL'. 274/38 [5 l] Int. Cl. Gllb 3/46 [58] Field of Search 274/38; 29/1695, l69.5 S.
[56] References Cited UNITED STATES PATENTS l.l l(l.428 9/l9l4 Edison' 274/38 ll/l929 8/l9Sl 11/1953 ll/l960 7/l96l 9/l966 Primary E.raminerLouis R. Prince Assistant Examiner-Charles E. Phillips Attorney. Agent, or Firm-Werner W. Kleeman ABSTRACT A pickup needle having a diamond tip soldered by a hard solder to a shaft. According to the invention the shaft is formed of a material selected from silicon carbide, boron carbide, corundum, quartz and glass having a melting point exceeding 800C.
6 Claims, 2 Drawing Figures BACKGROUND OF THE INVENTION The present invention relates to a new and improved pickup needle having a diamond tip soldered by means of a hard solder to a shaft. I
With most of the pickup needles employed at the present time at least the tip is formed of diamond, since this material offers suffi cient wear resistance in order to be able to ensure satisfactory sound pickup over a longer period of time, and therefore playback at microgrooved-long playing records, especially stereo records.
Belonging to the class of prior art pickup, needles of this type are those where the shaft is formedof metal, for instance, aluminum, steel -or molybdenum. Such type pickup needles have been disclosed, for instance, in the following publications: German patent publication 1,552,160, Swiss patent 377,119, British patent 836,768, Dutch patent application 6l/268,734, Dutch patent, 101,167 and U.S. Pat. Nos. 2,961,750, 2,570,248 and 2,960,759. In these prior art disclosures the diamond tip is flanged-in or soldered. One of the drawbacks of such needles, is theirrelatively great 'weight which is essentially ascribed .tothe shaft. In fact the specific weight of such needles is in the order of magnitude of approximately 7.9 gmslcm tsteel) and l 1.0 gms/cm (molybdenum). Even if the dimensions of the needles are verysmall their weight hasa measurable influence upon theinertia of the sound pickupsystem, which is noticeable during pickup of-high frequencies in the region beginning approximately at l2-kHz.
Needles having a metalshaft possess the further draw back that they are susceptible to corrosion. This drawback is particularly then prevalent when therecord' to be played is wet or contains an anti static coating.
In this regard it should be mentioned thatthe equally known pickup needles embodying a diamond tip bonded upon orto an aluminum shaft are more favorable since they possess a considerably smaller specific weight, in the order of magnitude of 2.7 3.5 gms/cm. The drawback of such type needle resides in the unreliable connection joint between the shaft and the tip which, as a general rule,-does not possess any satisfactory prolonged alternating-stress strength inorder to be even able to approximately approach the longevity of the diamond tip.
Finally, there are also known to the art from German patent publication l,l80, l 56 pickup needles ground of one-piece from diamond. While such possess a low specific weight of 3.4 gms/cm they are however extremely expensive as concerns the raw material and machining.
SUMMARY'QF THE'INVENTION construction of pickup needle of the previously mentioned type which exhibits the advantages of the needles formed completely of diamonds and avoids the drawbacks of needles formed with metal shafts, without requiring as concerns the raw material or fabrication costs a' greater expenditure than with metal shafts.
Yet afurther significant object of the present invention relates to an improved construction of pickup needle having a diamond tip and a shaft formed of a material which imparts increased lightweight characteristics to the needle while improving upon the sound pickup characteristics thereof, especially at high frequencies.
Now in order to implement these and still further obl5 jects 'of the invention, which will become more readily apparent as the description proceeds, the proposed pickup needle of this development is manifested by the features that the shaft is formed of a material selected from silicon carbide, boron carbide, corundum, quartz and glass having a melting point exceeding 800C.
According to a particularly advantageous aspect of this development, there is preferably employed as the shaft material monocrystalline corundum, for instance ruby or sapphire, preferably synthetic colorless sapphire. This material possesses increased hardness and mechanical as well as chemical resistance and is extremely' well suited for subsequent mounting of the needle at the needle support.
Also suitable as the shaft material is glass, having a meltingpoint exceeding 800C., that is, SiO and A1 0 containing glass. Also suitable as the shaft material is quartz, especially monocyrstalline quartz, and silicon carbide, especially monocrystalline silicon carbide.
It hasbee 'n found that the hard soldered connection between the shaft material and the'diamond tip, even with a planar impact surface, possesses a higher mechanicalstrength than the shaft material. This is surprising since previously it was assumed that such was BRIEF DESCRIPTION OF THE DRAWING The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawing wherein:
FIG. 1 is an exploded view of the components of a pickup needle designed according to the teachings of the present invention prior to final machining; and
FIG. 2 schematically illustrates a finished machined pickup needle produced according to the teachings of this invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Describing now the drawing, in FIG. 1 there is shown a blank 1 of a cylindrical shaft, formed of any of the materials heretofore disclosed, and which is provided at its upper end face with a slight depression or recess 2. Reference numeral 3 designates a layer of a hard solder and reference character 4 a raw or semi-finished diamond grain.
Soldering of the diamond grain 4 to the blank shaft 1 can be performed, for instance, by way of example but not exclusively, according to the techniques described in U.S. Pat. No. 2,570,248, so that no further discussion thereof would appear to be necessary. As a general rule, the blank shaft 1 possesses a diameter which is in the order of 0.6 and 1.0 mm. and in its raw or blank state its length, similar to the known pickup needles formed completely of sapphire, is in the order of 0.8 and 1.6 mm. However, in this respect it is to be mentioned that the selection of such dimensions depends to a large degree upon the machining means used for grinding the tip.
The finished machine tip has been illustrated in FIG. 2. it will be recognized that the blank shaft 1 of FIG. 1 is slightly conically pointed at its end carrying the diamond grain 4 and therefore has now become the needle shaft 1'. Similarly, the hard solder layer is apparent and has been designated by reference character 3' whereas the diamond grain 4 has been essentially ground into a cone 4' having a rounded tip 5 and further possesses a highly polished outer surface at least at the region of tip 5. The degree of finishing or machining of the pickup needle depicted in FIG. 2 corresponds to the needles employed in commercially available pickups, that is to say, possess a diameter in the order of magnitude between 0.4 and 0.8 mm., a length in the order of magnitude of 0.8 to 1.2 mm., a cone angle of the tip in the order of magnitude of 40 to 60, a radius of curvature of the tip in the order of magnitude of 0.012 to 0.025 mm (for long playing records).
it should be understood that for the described needle there can be also ground a so-called bi-radial tip, that is, a tip the cone of which at least at the region of the rounded portion of the tip possesses an elliptical outline so that the rounded portion of the tip in two axial cutting planes perpendicular to one another possesses a respective minimum value of for instance 0.012 mm. and a maximum value of for instance 0.025 mm.
It has been found that with the described pickup needle it is possible, without any greater expenditure, to reduce the needle weight from about 0.5 mg. (for known needles having a shaft formed of steel of molybdenum) to approximately 0.15 mg.
Such values could be only previously realized with noncomparable expensive needles formed completely of diamond or having a shaft formed of aluminum, which however owing to the lower prolonged alternating-stress strength and the difficulties arising during mounting at the pickup are not satisfactory.
Additionally, the described pickup needle is just as nonsensitive to corrosion effects of all types, such as those caused by humidity, smoke, human perspiration, anti-static agents, and so forth, as pure diamond needies, yet in contrast to such is a number of times cheaper. When forming the shaft from a material as proposed by this development for such diamond tip needle,' the pickup needle advantageously possesses a lower specific weight, which preferably amounts to about 4.00 gm/cm or less, depending upon the specific material selected for the shaft.
While there is shown and described present preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto but may be otherwise variously embodied and practiced within the scope of the following claims. Accordingly,
What is claimed is:
1. A pickup needle comprising a non-metallic shaft, a diamond tip, and a hard solder layer therebetween bonding the diamond tip to such nonmetallic shaft, said non-metallic shaft being formed of a material selectedfrom the group consisting of silicon carbide, boron carbide, corundum, and quartz.
2. The pickup needle as defined in claim 1, wherein the shaft is formed of monocrystalline corundum.
3. The pickup needle as defined in claim 2, wherein the shaft is formed of synthetic colorless sapphire.
4. The pickup needle as defined in claim 1, wherein the shaft is formed of monocrystalline quartz.
5. The pickup needle as defined in claim 1, wherein the shaftis formed of monocrystalline silicon carbide.
does not exceed about 4.00 gms/cm.
Claims (5)
- 2. The pickup needle as defined in claim 1, wherein the shaft is formed of monocrystalline corundum.
- 3. The pickup needle as defined in claim 2, wherein the shaft is formed of synthetic colorless sapphire.
- 4. The pickup needle as defined in claim 1, wherein the shaft is formed of monocrystalline quartz.
- 5. The pickup needle as defined in claim 1, wherein the shaft is formed of monocrystalline silicon carbide.
- 6. The pickup needle as defined in claim 1, wherein such pickup needle possesses a specific weight which does not exceed about 4.00 gms/cm3.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH860571A CH554578A (en) | 1971-06-12 | 1971-06-12 | CARTRIDGE NEEDLE. |
Publications (1)
Publication Number | Publication Date |
---|---|
US3813101A true US3813101A (en) | 1974-05-28 |
Family
ID=4342531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00249687A Expired - Lifetime US3813101A (en) | 1971-06-12 | 1972-05-01 | Pickup needle |
Country Status (9)
Country | Link |
---|---|
US (1) | US3813101A (en) |
JP (1) | JPS5551244B1 (en) |
BE (1) | BE784733A (en) |
CH (1) | CH554578A (en) |
DE (1) | DE2221428C3 (en) |
FR (1) | FR2141679B1 (en) |
GB (1) | GB1344227A (en) |
IT (1) | IT956484B (en) |
NL (1) | NL170570C (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4105213A (en) * | 1975-10-15 | 1978-08-08 | Victor Company Of Japan, Ltd. | Device for cutting a sound groove on a disc recording medium |
US4542493A (en) * | 1980-12-05 | 1985-09-17 | Victor Company Of Japan, Limited | Pickup stylus having fused diamond and ceramic bodies with conductive surfaces for capacitance disk records |
USD882653S1 (en) | 2015-07-06 | 2020-04-28 | Sumitomo Electric Hardmetal Corp. | Drilling tool |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0020843A1 (en) * | 1979-06-22 | 1981-01-07 | Diamond S.A. | Pick-up stylus for gramophone |
AT365800B (en) * | 1979-10-12 | 1982-02-10 | Akg Akustische Kino Geraete | MANUFACTURING METHOD FOR A NEEDLE OF A PICKUP |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1110428A (en) * | 1910-03-23 | 1914-09-15 | New Jersey Patent Co | Process of forming phonograph-styli. |
US1737253A (en) * | 1926-10-02 | 1929-11-26 | Rca Corp | Means for recording and reproducing sound |
US2564136A (en) * | 1943-03-04 | 1951-08-14 | Hartford Nat Bank & Trust Co | Corundum crystal recording or reproducing member |
US2659181A (en) * | 1947-01-30 | 1953-11-17 | Union Carbide & Carbon Corp | Process of and apparatus for forming styluslike articles from corundum or spinel |
US2960759A (en) * | 1957-12-27 | 1960-11-22 | Gen Electric | Methods of manufacturing phonograph styli |
US2992007A (en) * | 1957-12-27 | 1961-07-11 | Gen Electric | Phonograph stylus |
US3271036A (en) * | 1963-05-06 | 1966-09-06 | Paul L Kuzmick | Phonograph stylus and method of making same |
-
1971
- 1971-06-12 CH CH860571A patent/CH554578A/en not_active IP Right Cessation
-
1972
- 1972-05-01 US US00249687A patent/US3813101A/en not_active Expired - Lifetime
- 1972-05-02 DE DE2221428A patent/DE2221428C3/en not_active Expired
- 1972-05-10 FR FR7216761A patent/FR2141679B1/fr not_active Expired
- 1972-05-17 NL NLAANVRAGE7206618,A patent/NL170570C/en not_active IP Right Cessation
- 1972-05-17 GB GB2319672A patent/GB1344227A/en not_active Expired
- 1972-06-12 JP JP5774672A patent/JPS5551244B1/ja active Pending
- 1972-06-12 IT IT25574/72A patent/IT956484B/en active
- 1972-06-12 BE BE784733A patent/BE784733A/en unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1110428A (en) * | 1910-03-23 | 1914-09-15 | New Jersey Patent Co | Process of forming phonograph-styli. |
US1737253A (en) * | 1926-10-02 | 1929-11-26 | Rca Corp | Means for recording and reproducing sound |
US2564136A (en) * | 1943-03-04 | 1951-08-14 | Hartford Nat Bank & Trust Co | Corundum crystal recording or reproducing member |
US2659181A (en) * | 1947-01-30 | 1953-11-17 | Union Carbide & Carbon Corp | Process of and apparatus for forming styluslike articles from corundum or spinel |
US2960759A (en) * | 1957-12-27 | 1960-11-22 | Gen Electric | Methods of manufacturing phonograph styli |
US2992007A (en) * | 1957-12-27 | 1961-07-11 | Gen Electric | Phonograph stylus |
US3271036A (en) * | 1963-05-06 | 1966-09-06 | Paul L Kuzmick | Phonograph stylus and method of making same |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4105213A (en) * | 1975-10-15 | 1978-08-08 | Victor Company Of Japan, Ltd. | Device for cutting a sound groove on a disc recording medium |
US4542493A (en) * | 1980-12-05 | 1985-09-17 | Victor Company Of Japan, Limited | Pickup stylus having fused diamond and ceramic bodies with conductive surfaces for capacitance disk records |
USD882653S1 (en) | 2015-07-06 | 2020-04-28 | Sumitomo Electric Hardmetal Corp. | Drilling tool |
USD910093S1 (en) * | 2015-07-06 | 2021-02-09 | Sumitomo Electric Hardmetal Corp. | Drilling tool |
Also Published As
Publication number | Publication date |
---|---|
BE784733A (en) | 1972-12-12 |
NL170570C (en) | 1982-11-16 |
DE2221428A1 (en) | 1972-12-21 |
DE2221428B2 (en) | 1974-09-05 |
FR2141679A1 (en) | 1973-01-26 |
IT956484B (en) | 1973-10-10 |
DE2221428C3 (en) | 1975-04-30 |
CH554578A (en) | 1974-09-30 |
NL7206618A (en) | 1972-12-14 |
GB1344227A (en) | 1974-01-16 |
JPS5551244B1 (en) | 1980-12-23 |
FR2141679B1 (en) | 1978-09-08 |
NL170570B (en) | 1982-06-16 |
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