# Relationship history for MSHA mine 4404192

Current hierarchy: **H C Bostic Coal Company Inc → H C Bostic Coal Company Inc → Tipple No 1**

- 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:** H C Bostic Coal Company Inc → Tipple No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H C Bostic Coal Company Inc → Tipple No 1; 1975-01-01 to 1985-10-23; source msha-controller-operator-history
- **controller_controls_operator:** H C Bostic Coal Company Inc → H C Bostic Coal Company Inc; 1975-01-01 to 1985-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Russell Energy Inc → Tipple No 1; 1985-10-24 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Vollmer Karl H → Tipple No 1; 1985-10-24 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Vollmer Karl H → Russell Energy Inc; 1985-10-24 to 1987-08-31; source msha-controller-operator-history
- **operator_operates_mine:** H C Bostic Coal Company Inc → Tipple No 1; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H C Bostic Coal Company Inc → H C Bostic Coal Company Inc; 1987-09-01 to current/open; source msha-controller-operator-history