# Relationship history for MSHA mine 1700756

Current hierarchy: **James L  Brochu → Flagstaff Construction → Huber Pit**

- 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:** Narrow Gauge Construction Inc → Huber Pit; 2003-12-11 to 2006-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Patrick G Mitchell → Huber Pit; 2003-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick G Mitchell → Narrow Gauge Construction Inc; 2003-12-11 to 2006-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Flagstaff Construction → Huber Pit; 2006-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Brochu → Huber Pit; 2006-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Brochu → Flagstaff Construction; 2006-05-17 to current/open; source msha-controller-operator-history