# Relationship history for MSHA mine 1510162

Current hierarchy: **Roy Robert C → Roy Energy Corp → No 1 Strip**

- 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

- **operator_operates_mine:** Young Energy Corp → No 1 Strip; 1977-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Young F W → No 1 Strip; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Young F W → Young Energy Corp; 1977-01-01 to 1979-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Roy Energy Corp → No 1 Strip; 1979-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy Robert C → No 1 Strip; 1979-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy Robert C → Roy Energy Corp; 1979-09-05 to current/open; source msha-controller-operator-history