# Relationship history for MSHA mine 1516883

Current hierarchy: **Sev.en Global Investments a.s. → Pine Branch Mining LLC → Combs Branch Job**

- 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:** David A  Duff → Combs Branch Job; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pine Branch Coal Sales Inc → Combs Branch Job; 1990-05-01 to 2012-11-08; source msha-controller-operator-history
- **controller_controls_operator:** David A  Duff → Pine Branch Coal Sales Inc; 1990-05-01 to 2012-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Pine Branch Mining LLC → Combs Branch Job; 2012-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas A  Potter et al → Combs Branch Job; 2012-11-09 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Pine Branch Mining LLC; 2012-11-09 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Pine Branch Mining LLC; 2012-11-09 to 2013-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Combs Branch Job; 2013-07-01 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Pine Branch Mining LLC; 2013-07-01 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → Combs Branch Job; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Pine Branch Mining LLC; 2020-06-01 to current/open; source msha-controller-operator-history