# Relationship history for MSHA mine 1501367

Current hierarchy: **Collier Jack → Pine Coal Corp → #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:** Pine Coal Corp → #1; 1950-01-01 to 1972-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Collier Herman → #1; 1950-01-01 to 1972-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Collier Herman → Pine Coal Corp; 1950-01-01 to 1972-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Pine Coal Corp → #1; 1972-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collier Jack → #1; 1972-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collier Jack → Pine Coal Corp; 1972-05-18 to current/open; source msha-controller-operator-history