发明授权
US3991934A Letter plates 失效
信板

Letter plates
摘要:
A letter plate comprising an extruded flap and an extruded frame, the flap and the frame having respective inter-engaging hinge formations which form parts of the respective extruded sections, the flap in one example having an integral lengthwise extending enlargement occupying a correspondingly shaped recess extending lengthwise of the frame.
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