Helvetia Coal Company
1979-03-14T12:00:00
SECRETARY OF LABOR,
MINE SAFETY AND HEALTH
ADMINISTRATION MSHA,
PETITIONER
v.
HELVETIA COAL COMPANY,
RESPONDENT
- PITT 79-12-P
Mine Name:
Lucerne No. 6 MineSECRETARY OF LABOR,
MINE SAFETY AND HEALTH
ADMINISTRATION MSHA,
PETITIONER
v.
KEYSTONE COAL MINING CORP.,
RESPONDENT
- PITT 79-5-P
Mine Name:
Margaret No. 11 Mine