# Relationship history for MSHA mine 4404685

Current hierarchy: **Porter Joseph H → Open Fork Coal Company Inc → No 1**

- 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:** P A M Coal Corp → No 1; 1977-04-01 to 1978-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Porter Paul James → No 1; 1977-04-01 to 1978-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Porter Paul James → P A M Coal Corp; 1977-04-01 to 1978-07-20; source msha-controller-operator-history
- **controller_controls_mine:** J Marc  Abadou → No 1; 1978-05-01 to 1979-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Pennington Coal Mining Company Inc → No 1; 1978-07-21 to 1979-09-25; source msha-controller-operator-history
- **controller_controls_operator:** J Marc  Abadou → Pennington Coal Mining Company Inc; 1978-07-21 to 1979-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Open Fork Coal Company Inc → No 1; 1979-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Porter Joseph H → No 1; 1979-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Porter Joseph H → Open Fork Coal Company Inc; 1979-09-26 to current/open; source msha-controller-operator-history