# Relationship history for MSHA mine 4402015

Current hierarchy: **H C Bostic Coal Company Inc → H C Bostic Coal Company Inc → #13 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:** H C Bostic Coal Company Inc → #13 Strip; 1950-01-01 to 1992-09-22; source msha-controller-operator-history
- **controller_controls_mine:** H C Bostic Coal Company Inc → #13 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H C Bostic Coal Company Inc → H C Bostic Coal Company Inc; 1950-01-01 to 1992-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Top Coal Company Inc → #13 Strip; 1992-09-23 to 1993-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Harold → #13 Strip; 1992-09-23 to 2001-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Harold → Mountain Top Coal Company Inc; 1992-09-23 to 1993-04-07; source msha-controller-operator-history
- **operator_operates_mine:** H C Bostic Coal Company Inc → #13 Strip; 1993-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H C Bostic Coal Company Inc → H C Bostic Coal Company Inc; 1993-04-08 to current/open; source msha-controller-operator-history