# Relationship history for MSHA mine 3602761

Current hierarchy: **Lamkie William J → Black Oak Development Corp → Jones Strip**

- 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:** P & N Coal Company Inc → Jones Strip; 1950-01-01 to 1990-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Ralph W  Neal → Jones Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph W  Neal → P & N Coal Company Inc; 1950-01-01 to 1990-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Lamkie William J → Jones Strip; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Oak Development Corp → Jones Strip; 1990-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lamkie William J → Black Oak Development Corp; 1990-06-26 to current/open; source msha-controller-operator-history