# Relationship history for MSHA mine 4606544

Current hierarchy: **Penn Virginia Corp → Paragon Coal Corp → Paragon Coal Corporation**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Glenhayes Coal Terminal Inc → Paragon Coal Corporation; 1982-07-01 to 1987-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Stafford C C Fred & Robert Martin → Paragon Coal Corporation; 1982-07-01 to 1987-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Stafford C C Fred & Robert Martin → Glenhayes Coal Terminal Inc; 1982-07-01 to 1987-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Coal Gasification Corp → Paragon Coal Corporation; 1987-08-17 to 1987-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Columbia Gas System Inc → Paragon Coal Corporation; 1987-08-17 to 1987-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Columbia Gas System Inc → Columbia Coal Gasification Corp; 1987-08-17 to 1987-09-03; source msha-controller-operator-history
- **operator_operates_mine:** P & C Bituminous Coal Inc → Paragon Coal Corporation; 1987-09-04 to 1993-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Pen Holdings Inc → Paragon Coal Corporation; 1987-09-04 to 1993-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Pen Holdings Inc → P & C Bituminous Coal Inc; 1987-09-04 to 1993-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Paragon Coal Corp → Paragon Coal Corporation; 1993-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Penn Virginia Corp → Paragon Coal Corporation; 1993-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Penn Virginia Corp → Paragon Coal Corp; 1993-03-30 to current/open; source msha-controller-operator-history