# Relationship history for MSHA mine 1510116

Current hierarchy: **Collie  Hall → Royalton Coal Corp → #1 Surface**

- 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:** Mid Con Corp & Royalton Coal Corp Inc → #1 Surface; 1975-09-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Royalton Coal Corp Inc → #1 Surface; 1976-11-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Mid Con Corp & Royalton Coal Corp Inc → Royalton Coal Corp Inc; 1976-11-01 to 1986-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Collie  Hall et al → #1 Surface; 1983-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Royalton Coal Corp → #1 Surface; 1986-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collie  Hall et al → Royalton Coal Corp; 1986-07-22 to current/open; source msha-controller-operator-history