# Relationship history for MSHA mine 3400954

Current hierarchy: **International Chemical Company Inc → Eastoak Coal Company Inc → Mine 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:** Burkdoll Lloyd F & Samuel Shaw Iii → Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bills Coal Company Inc → Mine No 1; 1976-04-14 to 1984-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Burkdoll Lloyd F & Samuel Shaw Iii → Bills Coal Company Inc; 1976-04-14 to 1984-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Hobbs & Oberg Mining Company Inc → Mine No 1; 1984-12-15 to 1987-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Hobbs James F & I G Oberg → Mine No 1; 1984-12-15 to 1987-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Hobbs James F & I G Oberg → Hobbs & Oberg Mining Company Inc; 1984-12-15 to 1987-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Eastoak Coal Company Inc → Mine No 1; 1987-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** International Chemical Company Inc → Mine No 1; 1987-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Chemical Company Inc → Eastoak Coal Company Inc; 1987-06-05 to current/open; source msha-controller-operator-history