# Relationship history for MSHA mine 4608175

Current hierarchy: **Showalter Richard L → K & B Coal Company → K & B No 8**

- 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:** Showalter Richard L → K & B No 8; 1988-04-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & B Coal Company → K & B No 8; 1992-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Showalter Richard L → K & B Coal Company; 1992-04-01 to current/open; source msha-controller-operator-history