# Relationship history for MSHA mine 4002025

Current hierarchy: **H S & W Company → Jamestown Mining Company → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Jamestown Mining Inc → No 1 Surface; 1976-03-01 to 1976-12-20; source msha-controller-operator-history
- **controller_controls_mine:** Riser Roy → No 1 Surface; 1976-03-01 to 1976-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Riser Roy → Jamestown Mining Inc; 1976-03-01 to 1976-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Jamestown Mining Company → No 1 Surface; 1976-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** H S & W Company → No 1 Surface; 1976-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H S & W Company → Jamestown Mining Company; 1976-12-21 to current/open; source msha-controller-operator-history