# Relationship history for MSHA mine 3503333

Current hierarchy: **Jayne L  Clarke; Terry L  Clarke → Pioneer Asphalt Inc → GRUBBS 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:** Pioneer Asphalt Inc → GRUBBS PIT; 1989-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terry L  Clarke et al → GRUBBS PIT; 1989-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Clarke et al → Pioneer Asphalt Inc; 1989-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jayne L  Clarke et al → Pioneer Asphalt Inc; 1989-05-01 to current/open; source msha-controller-operator-history