This marking plate, which may be a registration plate or a data plate, comprises at least one support plate (3) and symbols obtained by stamping the marking plate.

The loading device reduces the likelihood of marker plate (56) misfeed.

A marker plate removal system is also provided for removing embossed marker plates from the hopper system without the marker plates falling out of the stacked-order.

The top end of the cylinder includes a recess for receiving a label plate.

While boring through the concrete layers, the market plate will indicate whether there is any risk of puncturing the membrane (2).