A Census of Mobile Machines Used in U.S. Surface Coal Mines.
NTIS: PB 284 112 Available for Reference At Bureau Libraries :174 pages
Results are presented of a census of machines used in surface coal mines in the United States. The numbers of each machine type and model reported to be in use are tabulated for large and small mines in the eastern, central, and western regions. The average daily usage times of the major machine categories and the number of machines that have acoustical and other cabs are also tabulated. Projections of the total numbers of primary production machines are given.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 284 112 Available for Reference At Bureau Libraries
Bolt, Beranek & Newman, Inc.