# Relationship history for MSHA mine 1511364

Current hierarchy: **Isaac Morris Estate → M I Coal Company Inc → No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wicker Dan Et Al → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lucas James H → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Coal Corp → No 1 Mine; 1978-06-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Lucas James H → Rocky Mountain Coal Corp; 1978-06-01 to 1980-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Wicker Brothers Coal Company Inc → No 1 Mine; 1980-09-22 to 1981-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Wicker Dan Et Al → Wicker Brothers Coal Company Inc; 1980-09-22 to 1981-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Carry-On Coal Company Inc → No 1 Mine; 1981-08-04 to 1983-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Roger D  Barnette → No 1 Mine; 1981-08-04 to 1983-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Roger D  Barnette → Carry-On Coal Company Inc; 1981-08-04 to 1983-03-13; source msha-controller-operator-history
- **operator_operates_mine:** M I Coal Company Inc → No 1 Mine; 1983-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Isaac Morris Estate → No 1 Mine; 1983-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Isaac Morris Estate → M I Coal Company Inc; 1983-03-14 to current/open; source msha-controller-operator-history