# Relationship history for MSHA mine 1509832

Current hierarchy: **Newsome Maurice J & Sam Hamilton → New Ham Coal Company → No 3 Surface 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:** Stevens Paul → No 3 Surface Mine; 1975-08-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cameron Coal Corp → No 3 Surface Mine; 1976-07-22 to 1981-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Stevens Paul → Cameron Coal Corp; 1976-07-22 to 1981-05-18; source msha-controller-operator-history
- **operator_operates_mine:** New Ham Coal Company → No 3 Surface Mine; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Maurice J & Sam Hamilton → No 3 Surface Mine; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Maurice J & Sam Hamilton → New Ham Coal Company; 1981-05-19 to current/open; source msha-controller-operator-history