검색연산자 | 기능 | 검색시 예 |
---|---|---|
() | 우선순위가 가장 높은 연산자 | 예1) (나노 (기계 | machine)) |
공백 | 두 개의 검색어(식)을 모두 포함하고 있는 문서 검색 | 예1) (나노 기계) 예2) 나노 장영실 |
| | 두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색 | 예1) (줄기세포 | 면역) 예2) 줄기세포 | 장영실 |
! | NOT 이후에 있는 검색어가 포함된 문서는 제외 | 예1) (황금 !백금) 예2) !image |
* | 검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색 | 예) semi* |
"" | 따옴표 내의 구문과 완전히 일치하는 문서만 검색 | 예) "Transform and Quantization" |
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) | G10G-005/00 |
미국특허분류(USC) | 84/421 ; 403/391 |
출원번호 | US-0553650 (1975-02-27) |
발명자 / 주소 | |
인용정보 | 피인용 횟수 : 20 인용 특허 : 0 |
A kettle-shaped drum has an annular recess adjacently below the top end of its hollow body. The flexible drum head includes a peripheral rib disposed in the recess and engaged at the top by a bracket. A plurality of recessed tensioning screws that extend downwardly from the bracket are threaded into a shoulder beneath the recess to permit adjustment of the head tension. A framework for supporting a drum assembly includes a series of elongate frame members that are interconnected by a plurality of identical joints. Each component of the drum assembly is s...
A framework for supporting a drum above a floor, said framework comprising: a base engaging said floor; at least one elongate frame member supported by said base and disposed upwardly of said floor; a first joint member received on said frame member for selective pivotal and longitudinal movement with respect thereto, said first joint member including a pair of separable blocks having substantially flat surfaces positioned against one another, said blocks cooperating to present a bore through said first joint member of a size to closely receive said fram...