# Relationship history for MSHA mine 1511250

Current hierarchy: **Jones Harry C → N O R Inc → Pinson Branch 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

- **controller_controls_mine:** Blackburn Wesley → Pinson Branch Surface; 1974-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackhawk Mining Company Inc → Pinson Branch Surface; 1978-04-01 to 1981-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Wesley → Blackhawk Mining Company Inc; 1978-04-01 to 1981-06-25; source msha-controller-operator-history
- **operator_operates_mine:** C L & J Company → Pinson Branch Surface; 1981-06-26 to 1982-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Bass William S Sr → Pinson Branch Surface; 1981-06-26 to 1982-12-15; source msha-controller-operator-history
- **controller_controls_operator:** Bass William S Sr → C L & J Company; 1981-06-26 to 1982-12-15; source msha-controller-operator-history
- **operator_operates_mine:** N O R Inc → Pinson Branch Surface; 1982-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Harry C → Pinson Branch Surface; 1982-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Harry C → N O R Inc; 1982-12-16 to current/open; source msha-controller-operator-history