The goal of the invention is to solve the problems existed in the use of asbestos pad, increase utilization rate, improve worker's labour condition and reduce environmental pollution.

A simple tool for identifying these problems early in labour is the partograph – a graph of the progress of labour and the maternal and fetal condition.

In the case of the implement (a thing produced by Labour) a price of some sort is the necessary condition of its existence: but the land exists by nature.