# Relationship history for MSHA mine 4406478

Current hierarchy: **Grissom B  Taylor → State Line Sand Inc → Neck 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** James S  Jackson → Neck Road Pit; 1950-01-01 to 1993-05-25; source msha-controller-operator-history
- **operator_operates_mine:** Tidewater Sand Inc → Neck Road Pit; 1988-09-01 to 1993-01-25; source msha-controller-operator-history
- **controller_controls_operator:** James S  Jackson → Tidewater Sand Inc; 1988-09-01 to 1993-01-25; source msha-controller-operator-history
- **operator_operates_mine:** State Line Sand Inc → Neck Road Pit; 1993-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grissom B  Taylor → Neck Road Pit; 1993-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grissom B  Taylor → State Line Sand Inc; 1993-01-26 to current/open; source msha-controller-operator-history