# Relationship history for MSHA mine 1519205

Current hierarchy: **Headwaters Inc → Covol Fuels No. 2, LLC → Covol Fuels No. 2, LLC**

- 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:** Headwaters Inc → Covol Fuels No. 2, LLC; 2007-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Covol Fuels No 2 LLC → Covol Fuels No. 2, LLC; 2008-03-21 to 2013-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Headwaters Inc → Covol Fuels No 2 LLC; 2008-03-21 to 2013-01-15; source msha-controller-operator-history
- **operator_operates_mine:** BRC Minuteman LLC → Covol Fuels No. 2, LLC; 2013-01-16 to 2015-06-21; source msha-controller-operator-history
- **controller_controls_mine:** DB RC Investments II LLC → Covol Fuels No. 2, LLC; 2013-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DB RC Investments II LLC → BRC Minuteman LLC; 2013-01-16 to 2015-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Covol Fuels No. 2, LLC → Covol Fuels No. 2, LLC; 2015-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Headwaters Inc → Covol Fuels No. 2, LLC; 2015-06-22 to current/open; source msha-controller-operator-history