# Relationship history for MSHA mine 2602921

Current hierarchy: **Jonathan  Maxwell; James  Robinson; Kimberly  Robinson → Knox Excavating Inc → China Springs 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** James  Robinson et al → China Springs Pit; 2024-11-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knox Excavating Inc → China Springs Pit; 2026-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Robinson et al → Knox Excavating Inc; 2026-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kimberly  Robinson et al → Knox Excavating Inc; 2026-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  Maxwell et al → Knox Excavating Inc; 2026-04-10 to current/open; source msha-controller-operator-history