# Relationship history for MSHA mine 4405253

Current hierarchy: **Thyssen Schachtbau Gmbh → Betty B Coal Company Inc → #14**

- 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:** Guest River Coal Company Inc → #14; 1979-07-01 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Craft Ewing Jr → #14; 1979-07-01 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Craft Ewing Jr → Guest River Coal Company Inc; 1979-07-01 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Thyssen Schachtbau Gmbh → #14; 1982-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Betty B Coal Company Inc → #14; 1996-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thyssen Schachtbau Gmbh → Betty B Coal Company Inc; 1996-03-04 to current/open; source msha-controller-operator-history