# Relationship history for MSHA mine 1515250

Current hierarchy: **Owens Jack → Pa-Pa Coal Mining Company Inc → No 6**

- 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:** Biliter Marvin Jr → No 6; 1981-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owens Jack → No 6; 1985-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & D Coal Company Inc → No 6; 1985-06-01 to 1989-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Marie → No 6; 1985-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Marie → M & D Coal Company Inc; 1985-06-01 to 1989-08-21; source msha-controller-operator-history
- **operator_operates_mine:** M & Mb Coal Company → No 6; 1989-08-22 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Biliter Marvin Jr → M & Mb Coal Company; 1989-08-22 to 1990-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Pa-Pa Coal Mining Company Inc → No 6; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Jack → Pa-Pa Coal Mining Company Inc; 1990-10-01 to current/open; source msha-controller-operator-history