# Relationship history for MSHA mine 1516563

Current hierarchy: **Isaac Basil → 550 Mining Company Inc → #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

- **controller_controls_mine:** Caudill Emery → #1; 1987-09-01 to 1990-03-12; source msha-controller-operator-history
- **operator_operates_mine:** G S & M Coal Company Inc → #1; 1989-02-01 to 1990-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Caudill Emery → G S & M Coal Company Inc; 1989-02-01 to 1990-03-12; source msha-controller-operator-history
- **operator_operates_mine:** 550 Mining Company Inc → #1; 1990-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Isaac Basil → #1; 1990-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Isaac Basil → 550 Mining Company Inc; 1990-03-13 to current/open; source msha-controller-operator-history