# Relationship history for MSHA mine 4003630

Current hierarchy: **David  Stoltzfus; Arly  Kinniburgh → APAC Tennessee, Inc. → Stantonville Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** David  Stoltzfus et al → Stantonville Sand and Gravel; 2019-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K&S Sand & Gravel → Stantonville Sand and Gravel; 2024-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Stoltzfus et al → K&S Sand & Gravel; 2024-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arly  Kinniburgh et al → K&S Sand & Gravel; 2024-10-03 to current/open; source msha-controller-operator-history