# Relationship history for MSHA mine 1500085

Current hierarchy: **Arthur E  Walker III; Thomas S  Hinkle → Bourbon Limestone Company → BOURBON LIMESTONE CO**

- 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:** Bourbon Limestone Company → BOURBON LIMESTONE CO; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur E  Walker III et al → BOURBON LIMESTONE CO; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur E  Walker III et al → Bourbon Limestone Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas S  Hinkle  et al → Bourbon Limestone Company; 1950-01-01 to current/open; source msha-controller-operator-history