# Relationship history for MSHA mine 1517478

Current hierarchy: **Sev.en Global Investments a.s. → Blue Diamond Coal Company → No. 75**

- 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:** Blue Diamond Coal Company → No. 75; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Collins → No. 75; 1992-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 75; 1993-11-01 to 1994-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blue Diamond Coal Company; 1993-11-01 to 1994-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Twin Pines Inc → No. 75; 1994-07-12 to 1997-08-13; source msha-controller-operator-history
- **controller_controls_mine:** Allen G  Stump et al → No. 75; 1994-07-12 to 1998-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Allen G  Stump et al → Twin Pines Inc; 1994-07-12 to 1997-08-13; source msha-controller-operator-history
- **operator_operates_mine:** Calvary Coal Company Inc → No. 75; 1997-08-14 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Collins → Calvary Coal Company Inc; 1997-08-14 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No. 75; 1998-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 75; 1998-05-18 to 2014-09-03; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Blue Diamond Coal Company; 1998-05-18 to 2014-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 75; 2014-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → No. 75; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blue Diamond Coal Company; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → No. 75; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Blue Diamond Coal Company; 2020-06-01 to current/open; source msha-controller-operator-history