# Relationship history for MSHA mine 3503454

Current hierarchy: **Kevin A  Hampton; Randall B  Hampton → Hermiston Rock Products LLC → County Line 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

- **operator_operates_mine:** Hermiston Rock Products LLC → County Line Road Pit; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin A  Hampton et al → County Line Road Pit; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin A  Hampton et al → Hermiston Rock Products LLC; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall B  Hampton et al → Hermiston Rock Products LLC; 1997-10-01 to current/open; source msha-controller-operator-history