# Relationship history for MSHA mine 2902111

Current hierarchy: **Thayer Art & Jon Harms → Eagle/Mjb → San Lazarus Gulch**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mansal Gravel Company → San Lazarus Gulch; 1993-04-01 to 1994-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Mc Names Michael & Andrew Nolin → San Lazarus Gulch; 1993-04-01 to 1994-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Mc Names Michael & Andrew Nolin → Mansal Gravel Company; 1993-04-01 to 1994-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Eagle/Mjb → San Lazarus Gulch; 1994-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thayer Art & Jon Harms → San Lazarus Gulch; 1994-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thayer Art & Jon Harms → Eagle/Mjb; 1994-02-15 to current/open; source msha-controller-operator-history