# Relationship history for MSHA mine 1511848

Current hierarchy: **Miller Fred R → Fred R Miller Coal Corp → No 2 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:** Hyde David → No 2 Surface; 1977-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sturgeon Creek Coal Corp → No 2 Surface; 1979-04-01 to 1979-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Hyde David → Sturgeon Creek Coal Corp; 1979-04-01 to 1979-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Fred R Miller Coal Corp → No 2 Surface; 1979-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miller Fred R → No 2 Surface; 1979-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miller Fred R → Fred R Miller Coal Corp; 1979-11-06 to current/open; source msha-controller-operator-history