# Relationship history for MSHA mine 1202097

Current hierarchy: **Sev.en Global Investments a.s. → Triad Mining LLC → Switz City**

- 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:** Triad Mining Inc → Switz City; 1991-04-01 to 2014-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Timothy R  Aull et al → Switz City; 1991-04-01 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Timothy R  Aull et al → Triad Mining Inc; 1991-04-01 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Aull et al → Triad Mining Inc; 1991-04-01 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → Switz City; 2005-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Triad Mining Inc; 2005-06-01 to 2014-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Triad Mining LLC → Switz City; 2014-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Switz City; 2014-09-01 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Triad Mining LLC; 2014-09-01 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → Switz City; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Triad Mining LLC; 2020-06-01 to current/open; source msha-controller-operator-history