# Relationship history for MSHA mine 1516657

Current hierarchy: **Diaz S K → Diaz Mining Company → #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:** Robbins Gus D → #1; 1984-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Wallins Coal Company Inc → #1; 1989-06-01 to 1991-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Gus D → Harlan Wallins Coal Company Inc; 1989-06-01 to 1991-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Hood Carl E → #1; 1991-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Capital Mining Inc → #1; 1991-07-22 to 1991-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Hood Carl E → Capital Mining Inc; 1991-07-22 to 1991-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Diaz Mining Company → #1; 1991-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Diaz S K → #1; 1991-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Diaz S K → Diaz Mining Company; 1991-11-06 to current/open; source msha-controller-operator-history