# Relationship history for MSHA mine 3602188

Current hierarchy: **D & S Coal Company → D & S Coal Company → Kelley Run Bank**

- 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:** Maksimik Coal Company → Kelley Run Bank; 1950-01-01 to 1975-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Maksimik Coal Company → Kelley Run Bank; 1950-01-01 to 1975-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Maksimik Coal Company → Maksimik Coal Company; 1950-01-01 to 1975-03-16; source msha-controller-operator-history
- **operator_operates_mine:** D & S Coal Company → Kelley Run Bank; 1975-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D & S Coal Company → Kelley Run Bank; 1975-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** D & S Coal Company → D & S Coal Company; 1975-03-17 to current/open; source msha-controller-operator-history