| 摘要 |
An upper member of a housing and a plurality of key actuators are unified into a single flat sheet made by stainless steel. The respective ones of the key actuators are made movable by reducing the thickness of the corresponding limited regions of the stainless steel sheet. When a particular one of the key actuators is actuated, a movable contact on a conductive silicon rubber sheet will come into contact with a stationary contact on a circuit board.
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