# Relationship history for MSHA mine 0301596

Current hierarchy: **Cummins James B → Tri-State Coal Company Inc → Pine Mountain 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tri-State Coal Company → Pine Mountain No 1; 1985-05-01 to 1988-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Floyd Howard R → Pine Mountain No 1; 1985-05-01 to 1988-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Floyd Howard R → Tri-State Coal Company; 1985-05-01 to 1988-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Tri-State Coal Company Inc → Pine Mountain No 1; 1988-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cummins James B → Pine Mountain No 1; 1988-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cummins James B → Tri-State Coal Company Inc; 1988-10-10 to current/open; source msha-controller-operator-history