# Relationship history for MSHA mine 1507631

Current hierarchy: **Thomas C  Lackey → Unicorn Mining Inc → No-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:** Simpson James W → No-1; 1973-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Skyuka Mining Corp → No-1; 1974-11-01 to 1975-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Simpson James W → Skyuka Mining Corp; 1974-11-01 to 1975-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Joc Coal (Ky) Inc → No-1; 1975-07-28 to 1981-07-20; source msha-controller-operator-history
- **controller_controls_mine:** T W Oil Inc → No-1; 1975-07-28 to 1981-07-20; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → Joc Coal (Ky) Inc; 1975-07-28 to 1981-07-20; source msha-controller-operator-history
- **operator_operates_mine:** American Coal Company Inc → No-1; 1981-07-21 to 1985-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Cardinal Resources Inc → No-1; 1981-07-21 to 1985-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Resources Inc → American Coal Company Inc; 1981-07-21 to 1985-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Luttrell Mining Company Inc → No-1; 1985-09-16 to 1987-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Robert B → No-1; 1985-09-16 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Robert B → Luttrell Mining Company Inc; 1985-09-16 to 1987-01-27; source msha-controller-operator-history
- **operator_operates_mine:** Lovely Branch Inc → No-1; 1987-01-28 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Leatherwood Eddie → No-1; 1987-01-28 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Leatherwood Eddie → Lovely Branch Inc; 1987-01-28 to 1987-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Unicorn Mining Inc → No-1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas C  Lackey → No-1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas C  Lackey → Unicorn Mining Inc; 1987-05-01 to current/open; source msha-controller-operator-history