Hillhead 2012
19 - 21 June 2012
International live demonstration show for the quarrying, recycling and heavy construction industries at Hillhead Quarry, Buxton, UK.
semi-conductor
A material which has a resistivity which is high but not high enough to be classed as an insulator, ie it exhibits properties intermediate to those of conductors and insulators.
The monthly journal for the quarry products industry.