# Relationship history for MSHA mine 1511341

Current hierarchy: **Large Roger → Irishman Creek Coal Company Inc → Mine #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:** Large Roger → Mine #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hamby Charles T Et Al → Mine #1; 1977-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Large Coal Company → Mine #1; 1978-05-01 to 1979-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Large Roger → Large Coal Company; 1978-05-01 to 1979-01-28; source msha-controller-operator-history
- **operator_operates_mine:** Charles Hamby Mining Company Inc → Mine #1; 1979-01-29 to 1979-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Hamby Charles T Et Al → Charles Hamby Mining Company Inc; 1979-01-29 to 1979-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Irishman Creek Coal Company Inc → Mine #1; 1979-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Large Roger → Mine #1; 1979-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Large Roger → Irishman Creek Coal Company Inc; 1979-04-17 to current/open; source msha-controller-operator-history