US3796841A - Headsets - Google Patents

Headsets Download PDF

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Publication number
US3796841A
US3796841A US00249602A US3796841DA US3796841A US 3796841 A US3796841 A US 3796841A US 00249602 A US00249602 A US 00249602A US 3796841D A US3796841D A US 3796841DA US 3796841 A US3796841 A US 3796841A
Authority
US
United States
Prior art keywords
earpiece
mounting
earphone
user
support means
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
Application number
US00249602A
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English (en)
Inventor
A Gorman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Invisio Communications Ltd
Original Assignee
RACAL ACOUSTIC SERVICES Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RACAL ACOUSTIC SERVICES Ltd filed Critical RACAL ACOUSTIC SERVICES Ltd
Application granted granted Critical
Publication of US3796841A publication Critical patent/US3796841A/en
Assigned to RACAL ACOUSTIC SERVICES LIMITED reassignment RACAL ACOUSTIC SERVICES LIMITED MERGER (SEE DOCUMENT FOR DETAILS). Assignors: AMPLIVOX COMMUNICATIONS LIMITED, CHANGED TO, RACAL AMPLIVOX LIMITED, RACAL-AMPLIVOX COMMUNICATIONS LIMITED, CHANGED TO
Assigned to RACAL ACOUSTICS LIMITED reassignment RACAL ACOUSTICS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RACAL ACOUSTIC SERVICES LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • H04R5/0335—Earpiece support, e.g. headbands or neckrests
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H04R1/1066—Constructional aspects of the interconnection between earpiece and earpiece support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/342—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for microphones

Definitions

  • a headset is provided with a mounting member tached to the headband or for mounting on a spectacle frame.
  • the earpiece is in the end of a support member which is pivotally mounted on the mounting member in such a way that it can rotate about two References Cited mutually perpendicular axes perpendicular to the lon- UNITED STATES PATENTS gitudinal axis of the support member.
  • Some devices in use at present tend to use modern, sub-miniature hearing aid type transducers both for the earphone and the microphone.
  • the transducers are contained within the smallest possible housing and this housing is suitably attached to a side arm which is in turn mounted on a lightweight adjustable headband.
  • the sound from the wearers mouth is conveyed to the microphone unit by an acoustic tube shaped in the form of a boom arm such that its open end is adjacent to the wearers mouth whilst the other end is acoustically coupled to the microphone transducer.
  • the acoustic boom is normally adjustable, as necessary, to permit proper location of the open end close to the wearers mouth.
  • the earphone is coupled to the wearers ear by means of a flexible acoustic tube which terminates in some suitable type of eartip.
  • This eartip has to be firmly inserted into the outer end of the ear canal of the wearers ear in order properly to convey sound to the wearer.
  • the earphone and earphone coupling arrangements are therefore substantially identical to those commonly used in ear level hearing aids.
  • the invention comprises an earphone assembly comprising a mounting member provided with means for attachment to a device to be worn on the head, an earpiece support member mounted on said mounting member, said support member including an earpiece at its end remote from said mounting member, said support member being mounted on said mounting member by mounting means which permit pivoting of said bracket about each of two mutually perpendicular axes perpendicular to the longitudinal axis of said support member.
  • FIG. 1 is a perspective view of the headset described herein;
  • FIG. la shows a detail of the headband of said headset
  • FIG. 2 is a vertical section of the earphone assembly of said headset along the line AA of FIG. 2a;
  • FIG. 2a is an end view of the earphone assembly
  • FIG. 2b is a plan view of said earphone assembly
  • FIG. 3 is a view of the microphone-earphone assembly of said headset with the cover removed;
  • FIG. 3a is a view of the microphone-earphone assembly as seen from the upper edge of the drawing shown in FIG. 3;
  • FIG. 3b is a view of the microphone-earphone assembly as seen from the left-hand side of the drawing shown in FIG. 3;
  • FIG. 30 is a view of the microphone-earphone assembly as seen from the right-hand side of the drawing shown in FIG. 3.
  • reference numeral 1 indicates a lightweight headband composed of a suitable plastics material, preferably acetal resin.
  • This headband has two sliding metallic extension members 2, which permit proper fitting of the headband assembly to the necessary range of head sizes.
  • these sliding extensions consist of two long fingers which slide in slots in the front and rear edges of the plastic headband so that nothing protrudes beyond the outer surfaces of the headband.
  • Small inwardly projecting teeth at the upper ends of the fingers come up against small outwardly projecting features at the lower ends of the moulded slots in the headband so as to prevent the sliding members 2 from completely disengaging from the headband.
  • Two small sleeves 3 prevent the upper ends of the fingers from spreading apart and perhaps overcoming the action of the previously-mentioned teeth.
  • each side arm 4 serves the dual purpose of providing security of fitting to the wearers head and support for the earphone/microphone unit 5 mounting member.
  • the unit 5 can be fitted to the side arm on either side of the headband assembly or alternatively two units can be fitted, one on each side of the headband assembly to provide binaural listening. In this case, the second unit 5' would normally only contain an earphone arrangement.
  • the side arms 4 can be rotated to be parallel with the headband when unit 5 or units 5 and 5' are not fitted so as to permit packing in the smallest possible carrying container.
  • Units 5 and 5' are retained on the side arms 4 by suitable spring clips 6 and the earphone/microphone units 5 can be slid forwards or backwards on the side arms 4 to assist proper fitting .of the earphones to the wearers ears.
  • a locating arrangement consisting of a series of pips on the inside faces of the side arms 4 aand a series of mating holes in the clips 6 ensures that the earphone/microphone units remain in the chosen position on the side arms.
  • the earphone/microphone units can alternatively be fitted to normal spectacle frame side arms by virtue of the same clips 6 which are the appropriate size and shape for this purpose.
  • a connecting cable 7 for the two transducers emerges from the lower face of the earphone/microphone unit for connection to the necessary associate electronic communications system.
  • the boom tube 8 is a suitably shaped plastic member and is preferably made of polytetrafluoroethylene (PT FE) but can be made of other suitable material so as not to burn ormelt or char or give off unpleasant or dangerous fumes, if the wearer should accidentally apply a match flame or petrol or gas lighter flame or the lighted end of a cigarette, to the boom arm.
  • PT FE polytetrafluoroethylene
  • the end of the tube adjacent to the wearers mouth is fitted with a metallic member 9 to spread and dissipate any local source of heat which might be applied as described above.
  • the member 9 is also designed to retain a suitable acoustic filter within the open end of the tube to reduce implosive sounds due to the breath of the wearer passing over the end of the tube.
  • the tube 8 is rotatable about its mounting axis to the earphone/microphone unit and can also be slid vertically within its mounting. These features provide proper adjustment for placing the end of the tube adjacent to the wearers mouth.
  • the tube can also easily be withdrawn when necessary for cleaning or replacement and this feature also permits personal issue of the acoustic tube to individual users when the complete headset is not a personal issue but may be worn by a number of users, and this feature obviously increases the degree of hygiene.
  • the earphone transducer is contained within an earpiece support member comprising a moulded case, as shown in FIG. 2.
  • the plastic moulded case 10 has a tubular extension 11, and within this tubular extension is a metal tube 12 which isjust free to rotate within extension 11.
  • the rotation of this metal tube 12 is limited to about 200 total by means of a stop pin 13 which is firmly attached to the metal tube 12 and which moves in a suitable slot 14 in the plastic case 10 of the earphone.
  • the stop pin and the slot are so designed and dimensioned as to limit the rotational movement between the metal tube and the plastic moulding, to the aforesaid 200.
  • a metal cylinder 15 which is substantially solid and therefore very strong and which has rounded (i.e., radiused) ends.
  • This metal part 15 fits appropriately into a moulded cavity 16 in the earphone/microphone unit as shown in FIG. 3.
  • the correlation of the metal cylinder I5 and the corresponding moulded cavity 16 is such that, when the headset is fitted to the wearers head, the earphone can be swung through a limited arc in the vertical plane, as shown by 8-3 in FIG. 3, and can also be swung through a limited arc in the horizontal plane, as shown by C--C in FIG. 3c. Because of the correlation between extension 11 and tube 12 (FIG.
  • the earphone can also be rotated around the longitudinal axis of the tube 12 so as to permit the earphone sound exit to point either to the left or to the right, as viewed from the front of the wearer, for either left-hand or right-hand fitting.
  • This rotational feature also permits the best and most comfortable fitting of the sound exit of the earphone into the bowl of the wearers ear.
  • the sound exit of the earphone 17 is, in use, covered and extended by a soft and suitably shaped eartip 18 (FIG. 1).
  • the eartip can be shaped for insertion in the end of the ear canal, it is preferred that this item be arranged to sit gently and comfortably in the bowl of the wearers ear by appropriate use of the previously-mentioned vertical, horizontal and rotational adjustments of the earphone.
  • the eartip is made of suitable non-toxic and non-dermatitic material and its great advantage compared with the normal eartip arrangement is that, in this case, the eartip is not inserted into the ear canal at.all but merely rests lightly in the outer bowl of the ear.
  • the earphone may be swung slightly outwards from the bowl of the ear, under favourable and appropriate conditions, so that there is no contact at all between the eartip and the wearers ear. Under these conditions the earphone behaves as a radiator-type transducer. The volume level of the received sound falls somewhat, especially in the lower frequencies, but the reception is still sufficiently clear and loud for many purposes.
  • the earphone can be replaced in the bowl of the ear by a light and simple pressure on the rear of the earphone and to facilitate this type of usage, movement of the earphone in the horizontal arc, is intentionally made less stiff than movement in the vertical arc or in the rotational mode.
  • This feature is obtained by appropriate design of the arrangements providing the correlation between the solid cylinder 15 and the corresponding moulded cavity 16.
  • the solid cylinder is longer along its axis than is the diameter of the cylinder. There is friction between the radiused ends of the cylinder and the corresponding faces of the moulded cavity. It can be seen therefore that the friction applicable when the earphone is moved in the vertical plane, operates further from the point of rotation 19 (FIG.
  • the earphone mounting features permit the use of an earphone without any acoustic tube coupling and thus provide the smoother and generally superior frequency response which is obtainable without an acoustic tube.
  • the design features also permit satisfactory acoustic coupling to the wearers ear without the disadvantage of an eartip firmly inserted into the ear canal.
  • the eartip 18 is made of an appropriate grade of polyvinyl chloride although other materials could be used.
  • the eartip is easily removable from the earphone for purposes of replacement and cleaning and for personal issue so as to permit a high degree of hygiene.
  • the angular position of the eartip on the earphone is important and correct positioning is indicated by means of a red dot on the earphone cap 22 which the user arranges to coincide with a small cut-out 23 (FIG. 1) in the periphery of the eartip.
  • the microphone transducer is shown at 24 in FIG. 3, and the snout 25 serves the purpose of mounting and acoustically coupling the acoustic boom tube to the microphone.
  • a suitable lightweight and flexible cable 7 emerges from the bottom of the earphone/microphone unit and passes to a contact board within the earphone/rnioophone unit, as shown in F IG. 3.
  • a suitable resistive attenuating network can be fitted to this contact board so that alternative sensitivities and impedances of earphones can be provided at the time of manufacture to suit various user requirements.
  • a clothing clip is secured to the cable at an appropriate point along its length so as to help support the cable above this point and prevent disturbing forces from being applied to the headset due to movement of the wearers head and due to movement of the wearer generally, with respect to the equipment into which the headset is connected.
  • An earphone assembly comprising a. mounting means adapted for mounting on the head of a user;
  • earpiece means including an electro acoustical transducer
  • earpiece support means connected at one end with said earpiece means
  • connecting means comprises i. a cylinder mounted intermediate its ends at one end of and normal to said earpiece support means, said cylinder having rounded ends,
  • said mounting means containing a cavity receiving said cylinder, the configuration of said cavity in one plane conforming to the rounded ends of said cylinder to permit limited pivotal movement of said support means through a first are (8-8), the configuration of said cavity in the plane normal to said one plane conforming with the circular crosssection of said cylinder member to permit limited pivotal movement of said support means through a second arc.
  • connecting means further includes means affording rotational movement of said earpiece means about the longitudinal axis of said support means.
  • said earpiece means includes a pliable eartip member shaped to conform to the bowl of the ear of a user.
  • said mounting means includes spectacles connecting means for connecting the earpiece means with spectacles worn by a user.
  • Apparatus as defined in claim 1 and further including a microphone, and an acoustic tube connecting said microphone with said mounting means in such a manner that the distal end of the tube is adjacent the mouth of the user.
  • said earpiece means includes a pair of electro-acoustical transducers associated with the ears of the user, respectively.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Headphones And Earphones (AREA)
  • Telephone Set Structure (AREA)
US00249602A 1971-05-17 1972-05-02 Headsets Expired - Lifetime US3796841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1535571A GB1363723A (en) 1971-05-17 1971-05-17 Earphone assemblies

Publications (1)

Publication Number Publication Date
US3796841A true US3796841A (en) 1974-03-12

Family

ID=10057688

Family Applications (1)

Application Number Title Priority Date Filing Date
US00249602A Expired - Lifetime US3796841A (en) 1971-05-17 1972-05-02 Headsets

Country Status (9)

Country Link
US (1) US3796841A (OSRAM)
AU (1) AU461792B2 (OSRAM)
CA (1) CA997852A (OSRAM)
DE (1) DE2223102C2 (OSRAM)
DK (1) DK152320B (OSRAM)
FR (1) FR2137999B1 (OSRAM)
GB (1) GB1363723A (OSRAM)
NL (1) NL173009B (OSRAM)
SE (1) SE378968B (OSRAM)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971901A (en) * 1975-03-05 1976-07-27 Roanwell Corporation Communications headset with reversible mounting means
US3971900A (en) * 1975-03-05 1976-07-27 Roanwell Corporation Communications headset with rotatable and tiltable electrical connector
USRE30662E (en) * 1975-03-05 1981-06-30 Roanwell Corporation Communications headset with reversible mounting means
US4875233A (en) * 1987-10-16 1989-10-17 Derhaag Robert L Headset construction and method of making same
EP0372883A3 (en) * 1988-12-02 1991-04-03 Kabushiki Kaisha Toshiba Headphone device
US5035005A (en) * 1990-07-27 1991-07-30 Hung Huang C Inflight headset for civil aircraft
US6411709B1 (en) 1994-11-17 2002-06-25 Unex Corporation Flexible microphone boom
US6421426B1 (en) 1997-08-15 2002-07-16 Gn Netcom/Unex Inc. Infrared wireless headset system
WO2015096987A1 (de) * 2013-12-23 2015-07-02 Sennheiser Electronic Gmbh & Co. Kg Kopfhörer
CN104904234A (zh) * 2013-12-25 2015-09-09 松下知识产权经营株式会社 头戴式耳机
CN107181995A (zh) * 2017-07-03 2017-09-19 苏州飞斯利电子有限公司 一种新型耳机支架及其制备方法
US9973843B2 (en) 2014-08-15 2018-05-15 Zound Industries International Ab Ear gear with earpieces interconnected through headband with two legs
USD819604S1 (en) * 2015-12-30 2018-06-05 Oculus Vr, Llc Earbud connector plate
US10478123B2 (en) * 2013-10-30 2019-11-19 Cosinuss Gmbh Elastic sensor for measuring vital parameters in the auditory canal
US11051096B1 (en) 2020-02-11 2021-06-29 Ali Pournik Switchable headphone assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0659120B2 (ja) * 1983-05-31 1994-08-03 ソニー株式会社 ヘツドホン
AT379927B (de) * 1984-07-18 1986-03-10 Akg Akustische Kino Geraete Leichte hoer-sprechgarnitur
US4720857A (en) * 1985-12-06 1988-01-19 Plantronics, Inc. Miniaturized headset for two-way voice communication
CA2059597A1 (en) * 1991-01-22 1992-07-23 Paul A. Vogt Radio eyewear
GB2279201B (en) * 1993-06-16 1996-10-30 Ind Limited W Improvements in earphones

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1713206A (en) * 1922-10-16 1929-05-14 Gen Electric Telephone head set
US2337953A (en) * 1942-01-28 1943-12-28 Bell Telephone Labor Inc Telephone headset
GB731830A (en) * 1951-12-21 1955-06-15 Standard Telephones Cables Ltd Improvements in or relating to operator's telephone headsets
US2717930A (en) * 1952-02-25 1955-09-13 August L Hintz Ear-phone head support
FR1081227A (fr) * 1953-04-27 1954-12-16 Cie Ind Des Telephones Dispositif de liaison mécanique entre écouteur et microphone d'un casque d'opératrice
DE1079676B (de) * 1956-09-28 1960-04-14 Siemens Ag Fernsprechkopfgarnitur
US3184556A (en) * 1961-12-11 1965-05-18 Pacific Plantronics Inc Miniature headset-microphone adapted for use with a mask
FR1397803A (fr) * 1964-06-05 1965-04-30 Airmed Ltd Casque de télécommunication perfectionné
DE1931226U (de) * 1965-10-25 1966-01-20 Sennheiser Electronic Hoer-spechgeraet.

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971901A (en) * 1975-03-05 1976-07-27 Roanwell Corporation Communications headset with reversible mounting means
US3971900A (en) * 1975-03-05 1976-07-27 Roanwell Corporation Communications headset with rotatable and tiltable electrical connector
USRE30662E (en) * 1975-03-05 1981-06-30 Roanwell Corporation Communications headset with reversible mounting means
US4875233A (en) * 1987-10-16 1989-10-17 Derhaag Robert L Headset construction and method of making same
EP0372883A3 (en) * 1988-12-02 1991-04-03 Kabushiki Kaisha Toshiba Headphone device
US5035005A (en) * 1990-07-27 1991-07-30 Hung Huang C Inflight headset for civil aircraft
US6411709B1 (en) 1994-11-17 2002-06-25 Unex Corporation Flexible microphone boom
US6421426B1 (en) 1997-08-15 2002-07-16 Gn Netcom/Unex Inc. Infrared wireless headset system
US10478123B2 (en) * 2013-10-30 2019-11-19 Cosinuss Gmbh Elastic sensor for measuring vital parameters in the auditory canal
CN105900450A (zh) * 2013-12-23 2016-08-24 森海塞尔电子股份有限及两合公司 头戴式受话器
US9930439B2 (en) 2013-12-23 2018-03-27 Sennheiser Electronic Gmbh & Co. Kg Headphone
CN105900450B (zh) * 2013-12-23 2019-03-29 森海塞尔电子股份有限及两合公司 头戴式受话器
WO2015096987A1 (de) * 2013-12-23 2015-07-02 Sennheiser Electronic Gmbh & Co. Kg Kopfhörer
DE102013227088B4 (de) 2013-12-23 2021-11-04 Sennheiser Electronic Gmbh & Co. Kg Kopfhörer
CN104904234A (zh) * 2013-12-25 2015-09-09 松下知识产权经营株式会社 头戴式耳机
CN104904234B (zh) * 2013-12-25 2018-05-29 松下知识产权经营株式会社 头戴式耳机
US9973843B2 (en) 2014-08-15 2018-05-15 Zound Industries International Ab Ear gear with earpieces interconnected through headband with two legs
USD819604S1 (en) * 2015-12-30 2018-06-05 Oculus Vr, Llc Earbud connector plate
CN107181995A (zh) * 2017-07-03 2017-09-19 苏州飞斯利电子有限公司 一种新型耳机支架及其制备方法
US11051096B1 (en) 2020-02-11 2021-06-29 Ali Pournik Switchable headphone assembly

Also Published As

Publication number Publication date
GB1363723A (en) 1974-08-14
DK152320B (da) 1988-02-15
AU4190172A (en) 1973-11-08
FR2137999A1 (OSRAM) 1972-12-29
FR2137999B1 (OSRAM) 1973-07-13
AU461792B2 (en) 1975-06-05
DE2223102A1 (de) 1972-11-30
NL173009B (nl) 1983-06-16
NL7206581A (OSRAM) 1972-11-21
CA997852A (en) 1976-09-28
DE2223102C2 (de) 1983-03-31
SE378968B (OSRAM) 1975-09-15

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AS Assignment

Owner name: RACAL ACOUSTIC SERVICES LIMITED, VIRGINIA

Free format text: MERGER;ASSIGNORS:AMPLIVOX COMMUNICATIONS LIMITED, CHANGED TO;RACAL-AMPLIVOX COMMUNICATIONS LIMITED,CHANGED TO;RACAL AMPLIVOX LIMITED;REEL/FRAME:003810/0250

Effective date: 19690113