# Relationship history for MSHA mine 1513142

Current hierarchy: **Kendrick Lawrence & Dennis Coleman → Ken Cole Coal Corp → No 2**

- 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

- **operator_operates_mine:** H & D Coal Company → No 2; 1981-10-01 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Horton Steve → No 2; 1981-10-01 to 1986-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Horton Steve → H & D Coal Company; 1981-10-01 to 1986-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Ken Cole Coal Corp → No 2; 1986-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kendrick Lawrence & Dennis Coleman → No 2; 1986-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kendrick Lawrence & Dennis Coleman → Ken Cole Coal Corp; 1986-03-14 to current/open; source msha-controller-operator-history