# Relationship history for MSHA mine 1901327

Current hierarchy: **Jeffrey  Powell; Steven R  Powell → Powell Stone & Gravel → Teel Road 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

- **controller_controls_mine:** Jeffrey  Powell et al → Teel Road Pit; 1996-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Powell Stone & Gravel → Teel Road Pit; 2025-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey  Powell et al → Powell Stone & Gravel; 2025-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven R  Powell et al → Powell Stone & Gravel; 2025-10-08 to current/open; source msha-controller-operator-history