# Relationship history for MSHA mine 3303782

Current hierarchy: **Otis  Ashcraft → Ashcraft Sand & Gravel Company Inc → ASHCRAFT SAND & GRAVEL CO., INC.**

- 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:** Otis  Ashcraft → ASHCRAFT SAND & GRAVEL CO., INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ashcraft Sand & Gravel Company Inc → ASHCRAFT SAND & GRAVEL CO., INC.; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Otis  Ashcraft → Ashcraft Sand & Gravel Company Inc; 1979-11-01 to current/open; source msha-controller-operator-history