# Relationship history for MSHA mine 4404204

Current hierarchy: **Thyssen Schachtbau Gmbh → Betty B Coal Company Inc → Mine #13**

- 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:** Baker Energy Corp → Mine #13; 1975-10-01 to 1976-11-10; source msha-controller-operator-history
- **controller_controls_mine:** Betty B Coal Company Inc → Mine #13; 1975-10-01 to 1976-11-10; source msha-controller-operator-history
- **controller_controls_operator:** Betty B Coal Company Inc → Baker Energy Corp; 1975-10-01 to 1976-11-10; source msha-controller-operator-history
- **operator_operates_mine:** La Cima Minerals Inc → Mine #13; 1976-11-11 to 1976-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Buck → Mine #13; 1976-11-11 to 1976-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Buck → La Cima Minerals Inc; 1976-11-11 to 1976-12-16; source msha-controller-operator-history
- **operator_operates_mine:** United Castle Coal Company → Mine #13; 1976-12-17 to 1986-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  Fourticq et al → Mine #13; 1976-12-17 to 1986-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Fourticq et al → United Castle Coal Company; 1976-12-17 to 1986-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Thyssen Schachtbau Gmbh → Mine #13; 1982-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Betty B Coal Company Inc → Mine #13; 1986-03-19 to 1992-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Thyssen Schachtbau Gmbh → Betty B Coal Company Inc; 1986-03-19 to 1992-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Carl A  Hamilton et al → Mine #13; 1986-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wolverine Coal Company Inc → Mine #13; 1992-02-21 to 1994-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Carl A  Hamilton et al → Wolverine Coal Company Inc; 1992-02-21 to 1994-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Stephen D  Halsey et al → Wolverine Coal Company Inc; 1992-02-21 to 1994-04-25; source msha-controller-operator-history
- **operator_operates_mine:** Betty B Coal Company Inc → Mine #13; 1994-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thyssen Schachtbau Gmbh → Betty B Coal Company Inc; 1994-04-26 to current/open; source msha-controller-operator-history