| 摘要 |
The invention relates to a sheet material, contoured sheet material, or interface liner which is formulated and fabricated such that, when pressure is applied to said sheet material, contoured sheet material, or interface liner, said sheet material, contoured sheet material, or interface liner indicates the spot at which the pressure has been applied by effecting a change in the colour or appearance of said sheet material contoured sheet material, or interface liner itself. |
