WO2001089263A1 - Portable bone conduction and sound amplifying hearing aid - Google Patents

Portable bone conduction and sound amplifying hearing aid Download PDF

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Publication number
WO2001089263A1
WO2001089263A1 PCT/KR2000/000622 KR0000622W WO0189263A1 WO 2001089263 A1 WO2001089263 A1 WO 2001089263A1 KR 0000622 W KR0000622 W KR 0000622W WO 0189263 A1 WO0189263 A1 WO 0189263A1
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WO
WIPO (PCT)
Prior art keywords
sound
hearing aid
vibration
shaft
vibrator
Prior art date
Application number
PCT/KR2000/000622
Other languages
French (fr)
Inventor
Chang Chun
Original Assignee
Chang Chun
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 Chang Chun filed Critical Chang Chun
Priority to AU2000251135A priority Critical patent/AU2000251135A1/en
Publication of WO2001089263A1 publication Critical patent/WO2001089263A1/en

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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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers

Definitions

  • the present invention relates to a portable hearing aid, and more particularly, to a portable bone conduction and sound amplifying hearing aid having two sound transmission channels.
  • the human ear is divided into three primary parts: an external ear, a middle ear and an inner ear.
  • the vibration of externally audible sound is directed into an outer ear (pinna) and is transmitted to a tympanic membrane (eardrum) along an external auditory canal.
  • the external auditory canal is a kind of a tympanic tube whose one end is closed by the eardrum.
  • the vibration of the eardrum is transmitted to the inner ear via three ossicula chains, that is, a malleus, an incus, and a stapes.
  • lymph inside the cochlea moves, and thousands of tiny hair cells in the scala media of the cochlea sense the vibration of the lymph, to then convert the stimulus into an electrical signal. Then, if the electrical signal is transmitted to the brain through acoustic nerve, the sound is audible.
  • Hearing loss which requires wearing of a hearing aid, is classified into conductive hearing loss, sensorineural hearing loss and mixed hearing loss.
  • a hearing aid is classified into a box type, an ear-worn type and an implantable type.
  • most of conventional hearing aids which are of a sound amplifying type in which air vibrating sound wave vibrates the eardrum via the external auditory canal, transmit sound through a single channel, the effects of hearing aids cannot be fully exerted.
  • a hearing aid including an amplifier for amplifying an electrical sound signal to generate a signal for generating vibration and sound, and a vibration and sound generator for simultaneously generating vibration and sound according to the output of the amplifier, wherein the vibration and sound generator includes a permanent magnet fixed on a case, a vibrator having a shaft which is axially movable and an enameled copper wire wound around the shaft, the vibrator vibrating due to a. magnetic field formed by the signal provided from the amplifier, a cap fixed to the shaft of the vibrator, for transmitting vibration to the head, and a sound plate connected to the shaft of the vibrator, for generating sound.
  • the hearing aid is implemented in the form of a headset, in which the vibration and sound generator is fixed to both ends of a headband.
  • FIG. 1 illustrates a state in which a hearing aid according to the present invention is worn by a user
  • FIG. 2 illustrates the concept of a bone conduction and sound amplifying hearing aid according to the present invention
  • FIG. 3 is a schematic diagram of a vibration and sound generator according to the present invention.
  • FIG. 4 is a block diagram showing the overall structure of a hearing aid according to the present invention.
  • FIG. 1 shows a state in which a hearing aid according to the present invention is worn by a user.
  • the hearing aid according to the present invention includes a headset 120 and a control box 100.
  • the headset 120 includes a microphone 122, a headband 126 and a vibration and sound generator 124.
  • the microphone 122 senses ambient sound and transmits the same to the control box 100.
  • the headband 126 is a flexible band and closely attaches the microphone 122 and the vibration and sound generator 124 to the head.
  • the vibration and sound generator 124 constructed as shown in FIG. 3 to be described later, vibrates 0 to 20,000 times per second to generate sound and vibration within the audio frequency range.
  • the control box 100 which can be carried in a pocket or worn on the waist of the user, includes an output control switch 102, a first jack 106 for connecting a microphone plug 128, a second jack 108 for inserting a vibration and sound generator plug 130, a recharge-indicating lamp 110, an operation-indicating lamp 112, a power switch 114 and a third jack 116 for receiving the DC power from an adapter 140. Also, a battery 104 for supplying power, and a printed circuit board (PCB) 105 for amplifying a signal input from the microphone 122 to generate sound and a vibration signal, are incorporated in the control box 100.
  • PCB printed circuit board
  • FIG. 2 illustrates the concept of the bone conduction and sound amplifying hearing aid according to the present invention.
  • sound is transmitted by a first channel by which amplified sound is transmitted to the inner ear through the external ear and the middle ear, like in the conventional hearing aid, and a second channel by which vibration for bone conduction hearing is transmitted to the inner ear through the skull.
  • the vibration and sound generator 124 receives the amplified sound signal from the control box 100 to simultaneously generate the vibration and sound within the audio frequency range.
  • the vibration for bone conduction hearing is transmitted to the inner ear (acoustic nerve) through the skull, and the amplified sound is transmitted to the inner ear through the external ear and the middle ear.
  • the hearing aiding effect is excellent compared to the conventional hearing aid in which sound is transmitted through a single channel.
  • FIG. 3 shows the structure of the vibration and sound generator 124 according to the present invention.
  • the vibration and sound generator 124 simultaneously generates vibration and sound, by including a permanent magnet 304 fixed on a case 302, for generating a magnetic field, a vibrator 306 spaced apart from the permanent magnet 304 and the case 302 to be movable axially and having an enameled copper wire 310 wound around a shaft 308, so as to vibrate according to the magnitude of an electrical signal flowing in the enameled copper wire 310, a cap 314 fixed to the shaft 308 of the vibrator 306, for transmitting vibration to the head (skull), and a sound plate 312 connected to the shaft 308 of the vibrator 306, for generating sound.
  • the sound plate 312 is formed of a flat spring covered with a film to allow the shaft 308 to sensitively move, and generates sound.
  • the arrangement of the permanent magnet 304 and the enameled copper wire 310 may be made vice versa so as to facilitate the connection of electric wires.
  • the vibrating speed and amplitude of the vibrator 306 is controlled by the output signal of the control box 100, and the magnitude of the sound generated by the sound plate 312 is also controlled by the control box 100.
  • the enameled copper wire 310 receives a sound signal from the control box 100 to make a magnetic field, which interacts with the magnetic field generated by the permanent magnet 304 to make the shaft 308 vibrate up and down.
  • the vibration of the shaft 308 is transmitted to the skull through the cap 314, and the sound generated by the sound plate 312 is transmitted to the inner ear through the external ear.
  • FIG. 4 is a block diagram showing the overall structure of the hearing aid according to the present invention, which includes a microphone 122 and a vibration and sound generator 124, both fixed to a headset, a control box 100 and an adapter 140.
  • the control box 100 includes a rechargeable battery 104, a charging controller 320, a recharge-indicating lamp 110, a power switch 114, an operation-indicating lamp 112, an output control switch 102, an amplifier 310 and three jacks 106, 108 and 116.
  • the power switch 114 if the power switch 114 is turned on, the power is supplied from the rechargeable battery 104 to turn on the operation-indicating lamp 112 and to operate circuits in the control box 100.
  • An electrical signal from the microphone 122 through the first jack 106 is amplified by the amplifier 310 and is then output to the vibration and sound generator 124 through the second jack 108.
  • the magnitude of the amplified signal is controlled by the output control switch 102, and DC power is received from the adapter 140 through the third jack 116 to charge the rechargeable battery 104.
  • the charging controller 320 turns on the recharge-indicating lamp 110 for requesting recharge.
  • the adapter 140 installed outside the control box 100 supplies power required for recharging of the rechargeable battery 104. If the adapter 140 is connected to the control box 100, electrical circuits mounted on the PCB (105 of FIG. 1 or 2) operate and the rechargeable battery 104 is recharged.
  • the microphone 122 which is a highly sensitive microphone, senses ambient sound to transmit an electrical signal to the control box 100.
  • the vibration and sound generator 124 simultaneously generates vibration and sound.
  • the hearing aid according to the present invention vibration and sound are simultaneously generated and the sound is transmitted by a first channel using the external ear and the middle ear and a second channel using the skull, thereby improving the hearing aiding effect compared to a hearing aid using a single channel.
  • the hearing aid according to the present invention is in the form of a headset, it is easy to wear.
  • even a person having a hearing loss due to damage in the external ear and/or the middle ear can be aided in his/her hearing capability by bone conduction.
  • the hearing aid according to the present invention is in the form of a headset, it can be compatibly used with conventional sound amplifying hearing aids.
  • the present invention is applicable to portable hearing aids, particularly, hearing aids for people having a hearing loss due to damage in the external ear and/or the middle ear. Also, the hearing aid according to the present invention can be compatibly used with conventional sound amplifying hearing aids.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Headphones And Earphones (AREA)

Abstract

A portable bone conduction and sound amplifying hearing aid having two sound transmission channels is provided. The hearing aid includes an amplifier for amplifying an electrical sound signal to generate a signal for generating vibration and sound, and a vibration and sound generator for simultaneously generating vibration and sound according to the output of the amplifier, wherein the vibration and sound generator consists of a permanent magnet fixed on a case, a vibrator having a shaft which is axially movable and an enameled copper wire wound around the shaft, the vibrator vibrating due to a magnetic field formed by the signal input from the amplifier, a cap fixed to the shaft of the vibrator, for transmitting vibration to the head, and a sound plate connected to the shaft of the vibrator, for generating sound. The hearing aid simultaneously generates sound and vibration and transmits the sound via a first channel using external ear and middle ear and a second channel using skull, thereby improving the effect of the hearing aid compared to a hearing aid using one sound transmission channel. Also, since the hearing aid is in the form of a headset, wearing of the same is facilitated.

Description

PORTABLE BONE CONDUCTION AND SOUND AMPLIFYING HEARING AID
Technical Field
The present invention relates to a portable hearing aid, and more particularly, to a portable bone conduction and sound amplifying hearing aid having two sound transmission channels.
Background Art
In general, the human ear is divided into three primary parts: an external ear, a middle ear and an inner ear. The vibration of externally audible sound is directed into an outer ear (pinna) and is transmitted to a tympanic membrane (eardrum) along an external auditory canal. The external auditory canal is a kind of a tympanic tube whose one end is closed by the eardrum. The vibration of the eardrum is transmitted to the inner ear via three ossicula chains, that is, a malleus, an incus, and a stapes. If the vibration of the auditory ossicula is transmitted to cochlea through the footplate of the stapes, lymph inside the cochlea moves, and thousands of tiny hair cells in the scala media of the cochlea sense the vibration of the lymph, to then convert the stimulus into an electrical signal. Then, if the electrical signal is transmitted to the brain through acoustic nerve, the sound is audible.
Hearing loss, which requires wearing of a hearing aid, is classified into conductive hearing loss, sensorineural hearing loss and mixed hearing loss. A hearing aid is classified into a box type, an ear-worn type and an implantable type. However, since most of conventional hearing aids, which are of a sound amplifying type in which air vibrating sound wave vibrates the eardrum via the external auditory canal, transmit sound through a single channel, the effects of hearing aids cannot be fully exerted.
Disclosure of the Invention
It is an object of the present invention to provide a headset type hearing aid having improved hearing aiding effect by sound and bone conduction.
To accomplish the above object, there is provided a hearing aid including an amplifier for amplifying an electrical sound signal to generate a signal for generating vibration and sound, and a vibration and sound generator for simultaneously generating vibration and sound according to the output of the amplifier, wherein the vibration and sound generator includes a permanent magnet fixed on a case, a vibrator having a shaft which is axially movable and an enameled copper wire wound around the shaft, the vibrator vibrating due to a. magnetic field formed by the signal provided from the amplifier, a cap fixed to the shaft of the vibrator, for transmitting vibration to the head, and a sound plate connected to the shaft of the vibrator, for generating sound. The hearing aid is implemented in the form of a headset, in which the vibration and sound generator is fixed to both ends of a headband. Brief Description of the Drawings
The above object and advantages of the present invention will become more
apparent by describing in detail a preferred embodiment thereof with reference to the
attached drawing in which:
FIG. 1 illustrates a state in which a hearing aid according to the present invention is worn by a user;
FIG. 2 illustrates the concept of a bone conduction and sound amplifying hearing aid according to the present invention;
FIG. 3 is a schematic diagram of a vibration and sound generator according to the present invention; and FIG. 4 is a block diagram showing the overall structure of a hearing aid according to the present invention.
Best mode for carrying out the Invention
Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
FIG. 1 shows a state in which a hearing aid according to the present invention is worn by a user. The hearing aid according to the present invention includes a headset 120 and a control box 100. The headset 120 includes a microphone 122, a headband 126 and a vibration and sound generator 124. The microphone 122 senses ambient sound and transmits the same to the control box 100. The headband 126 is a flexible band and closely attaches the microphone 122 and the vibration and sound generator 124 to the head. The vibration and sound generator 124 constructed as shown in FIG. 3 to be described later, vibrates 0 to 20,000 times per second to generate sound and vibration within the audio frequency range. The control box 100 which can be carried in a pocket or worn on the waist of the user, includes an output control switch 102, a first jack 106 for connecting a microphone plug 128, a second jack 108 for inserting a vibration and sound generator plug 130, a recharge-indicating lamp 110, an operation-indicating lamp 112, a power switch 114 and a third jack 116 for receiving the DC power from an adapter 140. Also, a battery 104 for supplying power, and a printed circuit board (PCB) 105 for amplifying a signal input from the microphone 122 to generate sound and a vibration signal, are incorporated in the control box 100.
FIG. 2 illustrates the concept of the bone conduction and sound amplifying hearing aid according to the present invention. In the hearing aid according to the present invention, sound is transmitted by a first channel by which amplified sound is transmitted to the inner ear through the external ear and the middle ear, like in the conventional hearing aid, and a second channel by which vibration for bone conduction hearing is transmitted to the inner ear through the skull.
An electrical signal input through the microphone 122 or from an audio (or headphone) output plug of a TN, radio or audio product, is amplified by an amplifier implemented on the PCB 105 and then the amplified sound signal is output to the vibration and sound generator 124 according to the present invention. The vibration and sound generator 124, as shown in FIG. 3, receives the amplified sound signal from the control box 100 to simultaneously generate the vibration and sound within the audio frequency range. Thus, the vibration for bone conduction hearing is transmitted to the inner ear (acoustic nerve) through the skull, and the amplified sound is transmitted to the inner ear through the external ear and the middle ear.
As described above, according to the present invention, since sound is transmitted through two channels, the hearing aiding effect is excellent compared to the conventional hearing aid in which sound is transmitted through a single channel.
FIG. 3 shows the structure of the vibration and sound generator 124 according to the present invention. Referring to FIG. 3, the vibration and sound generator 124 simultaneously generates vibration and sound, by including a permanent magnet 304 fixed on a case 302, for generating a magnetic field, a vibrator 306 spaced apart from the permanent magnet 304 and the case 302 to be movable axially and having an enameled copper wire 310 wound around a shaft 308, so as to vibrate according to the magnitude of an electrical signal flowing in the enameled copper wire 310, a cap 314 fixed to the shaft 308 of the vibrator 306, for transmitting vibration to the head (skull), and a sound plate 312 connected to the shaft 308 of the vibrator 306, for generating sound. The sound plate 312 is formed of a flat spring covered with a film to allow the shaft 308 to sensitively move, and generates sound. In above configuration, the arrangement of the permanent magnet 304 and the enameled copper wire 310 may be made vice versa so as to facilitate the connection of electric wires.
The vibrating speed and amplitude of the vibrator 306 is controlled by the output signal of the control box 100, and the magnitude of the sound generated by the sound plate 312 is also controlled by the control box 100. In other words, the enameled copper wire 310 receives a sound signal from the control box 100 to make a magnetic field, which interacts with the magnetic field generated by the permanent magnet 304 to make the shaft 308 vibrate up and down. The vibration of the shaft 308 is transmitted to the skull through the cap 314, and the sound generated by the sound plate 312 is transmitted to the inner ear through the external ear. FIG. 4 is a block diagram showing the overall structure of the hearing aid according to the present invention, which includes a microphone 122 and a vibration and sound generator 124, both fixed to a headset, a control box 100 and an adapter 140. The control box 100 includes a rechargeable battery 104, a charging controller 320, a recharge-indicating lamp 110, a power switch 114, an operation-indicating lamp 112, an output control switch 102, an amplifier 310 and three jacks 106, 108 and 116.
Referring to FIG. 4, if the power switch 114 is turned on, the power is supplied from the rechargeable battery 104 to turn on the operation-indicating lamp 112 and to operate circuits in the control box 100. An electrical signal from the microphone 122 through the first jack 106 is amplified by the amplifier 310 and is then output to the vibration and sound generator 124 through the second jack 108. Here, the magnitude of the amplified signal is controlled by the output control switch 102, and DC power is received from the adapter 140 through the third jack 116 to charge the rechargeable battery 104.
If the voltage of the rechargeable battery 104 is lowered, the charging controller 320 turns on the recharge-indicating lamp 110 for requesting recharge. The adapter 140 installed outside the control box 100 supplies power required for recharging of the rechargeable battery 104. If the adapter 140 is connected to the control box 100, electrical circuits mounted on the PCB (105 of FIG. 1 or 2) operate and the rechargeable battery 104 is recharged.
The microphone 122, which is a highly sensitive microphone, senses ambient sound to transmit an electrical signal to the control box 100. The vibration and sound generator 124 simultaneously generates vibration and sound.
As described above, in the hearing aid according to the present invention, vibration and sound are simultaneously generated and the sound is transmitted by a first channel using the external ear and the middle ear and a second channel using the skull, thereby improving the hearing aiding effect compared to a hearing aid using a single channel. Also, since the hearing aid according to the present invention is in the form of a headset, it is easy to wear. In particular, according to the present invention, even a person having a hearing loss due to damage in the external ear and/or the middle ear can be aided in his/her hearing capability by bone conduction. Also, since the hearing aid according to the present invention is in the form of a headset, it can be compatibly used with conventional sound amplifying hearing aids.
Industrial Applicability
The present invention is applicable to portable hearing aids, particularly, hearing aids for people having a hearing loss due to damage in the external ear and/or the middle ear. Also, the hearing aid according to the present invention can be compatibly used with conventional sound amplifying hearing aids.
While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited the disclosed embodiment, but, on the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.

Claims

What is claimed is:
1. A portable bone conduction and sound amplifying hearing aid comprising: an amplifier for amplifying an electrical sound signal to generate a signal for generating vibration and sound; and a vibration and sound generator for simultaneously generating vibration and sound according to the output of the amplifier.
2. The portable bone conduction and sound amplifying hearing aid according to claim 1, further comprising a microphone for sensing an external signal, wherein the microphone and the vibration and sound generator are attached to both ends of a headband so that the hearing aid is implemented in the form of a headset.
3. The portable bone conduction and sound amplifying hearing aid according to claim 1, wherein the vibration and sound generator includes a permanent magnet fixed on a case, a vibrator having a shaft which is movable axially and an enameled copper wire wound around the shaft, the vibrator vibrating according to a magnetic field formed by a signal input from the amplifier, a cap fixed to the shaft of the vibrator, for transmitting vibration to the head, and a sound plate connected to the shaft of the vibrator for generating sound.
4. The portable bone conduction and sound amplifying hearing aid according to claim 3, wherein the sound plate is implemented by a flat spring covered by a film.
5. The portable bone conduction and sound amplifying hearing aid according to claim 1, wherein the amplifier controls the magnitude of the output signal thereof by an output control switch and is incorporated into a control box with a operation-indicating lamp which indicates the operational state and a power switch.
PCT/KR2000/000622 2000-05-17 2000-06-13 Portable bone conduction and sound amplifying hearing aid WO2001089263A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2000251135A AU2000251135A1 (en) 2000-05-17 2000-06-13 Portable bone conduction and sound amplifying hearing aid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20000013949U KR200200211Y1 (en) 2000-05-17 2000-05-17 Portable bone conduction hearing aid
KRU.M.2000-13949 2000-05-17

Publications (1)

Publication Number Publication Date
WO2001089263A1 true WO2001089263A1 (en) 2001-11-22

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AU (1) AU2000251135A1 (en)
WO (1) WO2001089263A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104010261A (en) * 2013-02-25 2014-08-27 旭达电脑（昆山）有限公司 Mobile handset hearing-aid
US8995688B1 (en) 2009-07-23 2015-03-31 Helen Jeanne Chemtob Portable hearing-assistive sound unit system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612915A (en) * 1985-05-23 1986-09-23 Xomed, Inc. Direct bone conduction hearing aid device
US5208867A (en) * 1990-04-05 1993-05-04 Intelex, Inc. Voice transmission system and method for high ambient noise conditions
JPH06233388A (en) * 1993-02-05 1994-08-19 Sony Corp Hearing aid
KR960015678A (en) * 1994-10-07 1996-05-22 양승택 Sound hearing device for the deaf
KR960016621A (en) * 1994-10-07 1996-05-22 양승택 Bone Headphones for the Deaf
US5673328A (en) * 1992-10-07 1997-09-30 Viennatone Gmbh Bone conducting hearing aid

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612915A (en) * 1985-05-23 1986-09-23 Xomed, Inc. Direct bone conduction hearing aid device
US5208867A (en) * 1990-04-05 1993-05-04 Intelex, Inc. Voice transmission system and method for high ambient noise conditions
US5673328A (en) * 1992-10-07 1997-09-30 Viennatone Gmbh Bone conducting hearing aid
JPH06233388A (en) * 1993-02-05 1994-08-19 Sony Corp Hearing aid
KR960015678A (en) * 1994-10-07 1996-05-22 양승택 Sound hearing device for the deaf
KR960016621A (en) * 1994-10-07 1996-05-22 양승택 Bone Headphones for the Deaf

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8995688B1 (en) 2009-07-23 2015-03-31 Helen Jeanne Chemtob Portable hearing-assistive sound unit system
CN104010261A (en) * 2013-02-25 2014-08-27 旭达电脑（昆山）有限公司 Mobile handset hearing-aid

Also Published As

Publication number Publication date
AU2000251135A1 (en) 2001-11-26
KR200200211Y1 (en) 2000-10-16

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