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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0301648 (1994-09-07) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 20 인용 특허 : 0 |
An acoustic board including a front panel formed with a plurality of large openings and small openings, a rear panel having a distance from the front panel, an intermediate panel fitted between the front panel and the rear panel thereby forming a front chamber between the front panel and the interme
An acoustic board comprising: a front panel formed with a plurality of large openings and small openings; a rear panel having a distance from said front panel; an intermediate panel fitted between said front panel and said rear panel thereby forming a front chamber between said front panel and said
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