# Relationship history for MSHA mine 1800764

Current hierarchy: **David M  Maynard → Steyer Fuel Mining Co, Inc. → Steyer II**

- 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:** Steyer Fuel Mining Co, Inc. → Steyer II; 2004-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  Maynard → Steyer II; 2004-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Maynard → Steyer Fuel Mining Co, Inc.; 2004-05-25 to current/open; source msha-controller-operator-history