# Relationship history for MSHA mine 4607004

Current hierarchy: **Showalter Richard L → K & B Coal Company → K & B No 6**

- 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:** Frush James W Jr → K & B No 6; 1985-06-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cottle Coal Company Inc → K & B No 6; 1985-09-01 to 1986-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Frush James W Jr → Cottle Coal Company Inc; 1985-09-01 to 1986-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Mc Alpin Industrial Corp → K & B No 6; 1986-03-12 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Malcomb Charles L → K & B No 6; 1986-03-12 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Malcomb Charles L → Mc Alpin Industrial Corp; 1986-03-12 to 1990-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Showalter Richard L → K & B No 6; 1988-04-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & B Coal Company → K & B No 6; 1990-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Showalter Richard L → K & B Coal Company; 1990-02-06 to current/open; source msha-controller-operator-history