# Relationship history for MSHA mine 1512782

Current hierarchy: **Daniel Hershell → Rocky Face Coal Inc → No 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:** Roberts Lige → No 1 Surface; 1979-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Coal Company Inc → No 1 Surface; 1981-03-01 to 1982-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Lige → Trinity Coal Company Inc; 1981-03-01 to 1982-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Face Coal Inc → No 1 Surface; 1982-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel Hershell → No 1 Surface; 1982-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel Hershell → Rocky Face Coal Inc; 1982-01-06 to current/open; source msha-controller-operator-history