Supports – Easel; book – copy or music score holder – With article gripping means
Patent
1993-03-29
1994-05-17
Scherbel, David A.
Supports
Easel; book, copy or music score holder
With article gripping means
2484411, A47B 9704
Patent
active
053120825
ABSTRACT:
A clipboard includes a backing board on which a clip member is mounted pivotally, a torsional spring unit arranged between the backing board and the clip member so as to bias one end of the clip member to abut against the backing board, and a whistle formed integrally with the clip member.
REFERENCES:
patent: 2492034 (1949-12-01), Clyne
patent: 2782748 (1957-02-01), Zegarowitz
patent: 4709651 (1987-12-01), Lance
patent: 4892334 (1990-01-01), Sinclair
patent: 5040673 (1991-08-01), Huang et al.
patent: 5086726 (1992-02-01), Sharp
patent: 5180133 (1993-01-01), Chang
Chan Korie H.
Scherbel David A.
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