发明授权
US5813777A Stress relieving keys 失效
减压钥匙

Stress relieving keys
摘要:
A cushioned key including a top face, a bottom face, and four side faces. Each key has a hollow cushion compartment defined by the top face of the key, the side faces of the key and further a divider.
公开/授权文献
信息查询
0/0