# Relationship history for MSHA mine 4606900

Current hierarchy: **Henry Paul  Kizer → Stoney Coal Company → No 4 Mine**

- 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:** Henry Paul  Kizer et al → No 4 Mine; 1983-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoney Coal Company → No 4 Mine; 1985-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry Paul  Kizer et al → Stoney Coal Company; 1985-03-01 to current/open; source msha-controller-operator-history