# Relationship history for MSHA mine 4406634

Current hierarchy: **Thyssen Schachtbau Gmbh → Parts Corp Of America → Mine #4**

- 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:** Cantrell Guy S → Mine #4; 1981-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cantrell Mining Company Inc → Mine #4; 1991-03-01 to 1994-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Cantrell Guy S → Cantrell Mining Company Inc; 1991-03-01 to 1994-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Thyssen Schachtbau Gmbh → Mine #4; 1991-05-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tanstafl Inc → Mine #4; 1994-01-02 to 1995-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Anthony L → Mine #4; 1994-01-02 to 1995-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Anthony L → Tanstafl Inc; 1994-01-02 to 1995-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Ping Inc → Mine #4; 1995-01-06 to 1995-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Philpott Samuel F--David G Wallen Et Al → Mine #4; 1995-01-06 to 1995-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Philpott Samuel F--David G Wallen Et Al → Ping Inc; 1995-01-06 to 1995-08-29; source msha-controller-operator-history
- **operator_operates_mine:** Parts Corp Of America → Mine #4; 1995-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thyssen Schachtbau Gmbh → Parts Corp Of America; 1995-08-30 to current/open; source msha-controller-operator-history