# Relationship history for MSHA mine 1516986

Current hierarchy: **Ricky  Blair → Blair Coal Company Inc → Le-Ib 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dennis Allen  Ramey → Le-Ib Mine; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Eppie R → Le-Ib Mine; 1989-02-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** I B Mining Company → Le-Ib Mine; 1990-10-01 to 1991-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Tommy Et Al → Le-Ib Mine; 1990-10-01 to 1991-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Tommy Et Al → I B Mining Company; 1990-10-01 to 1991-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Jammer Mining Inc → Le-Ib Mine; 1991-06-21 to 1993-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Childers Michael & Pat Et Al → Le-Ib Mine; 1991-06-21 to 1993-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Childers Michael & Pat Et Al → Jammer Mining Inc; 1991-06-21 to 1993-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Flatwoods Coal Company Inc → Le-Ib Mine; 1993-09-17 to 1994-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Eppie R → Flatwoods Coal Company Inc; 1993-09-17 to 1994-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Sweatbee Coal Company → Le-Ib Mine; 1994-09-27 to 2000-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Dennis Allen  Ramey → Sweatbee Coal Company; 1994-09-27 to 2000-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Ricky  Blair → Le-Ib Mine; 1997-01-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blair Coal Company Inc → Le-Ib Mine; 2000-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky  Blair → Blair Coal Company Inc; 2000-10-03 to current/open; source msha-controller-operator-history