# Relationship history for MSHA mine 1514311

Current hierarchy: **Robbins Gus D → Harlan Wallins Coal 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:** Tony Carlis  Mahon → #1; 1983-09-13 to 1984-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Carl-Stan Enterprises Inc → #1; 1983-10-01 to 1984-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Tony Carlis  Mahon → Carl-Stan Enterprises Inc; 1983-10-01 to 1984-10-21; source msha-controller-operator-history
- **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; 1984-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Gus D → Harlan Wallins Coal Company Inc; 1984-10-22 to current/open; source msha-controller-operator-history