# Relationship history for MSHA mine 0504457

Current hierarchy: **Spottswood Coal Company & Myakka Equity Inc → Honeywood Coal Company → Hamilton 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

- **operator_operates_mine:** Honeywood Coal Company → Hamilton Mine; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spottswood Coal Company & Myakka Equity Inc → Hamilton Mine; 1991-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spottswood Coal Company & Myakka Equity Inc → Honeywood Coal Company; 1991-06-01 to current/open; source msha-controller-operator-history