# Relationship history for MSHA mine 1509499

Current hierarchy: **Bingham Arnold B → Arnphil Coal Inc → No 2 Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Bingham Arnold B → No 2 Surface; 1974-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arnphil Coal Inc → No 2 Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bingham Arnold B → Arnphil Coal Inc; 1976-01-01 to current/open; source msha-controller-operator-history