# Relationship history for MSHA mine 3401027

Current hierarchy: **Jerry D  Pryor; Thomas  Pryor → Pryor Sand & Redi-Mix, Inc → Pryor Sand & Redi Mix, 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** H & C Sand & Gravel Company → Pryor Sand & Redi Mix, Inc; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Joe  Harrell  et al → Pryor Sand & Redi Mix, Inc; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Harrell  et al → H & C Sand & Gravel Company; 1950-01-01 to 1979-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Pryor Sand & Redi-Mix, Inc → Pryor Sand & Redi Mix, Inc; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry D  Pryor et al → Pryor Sand & Redi Mix, Inc; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry D  Pryor et al → Pryor Sand & Redi-Mix, Inc; 1979-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Pryor et al → Pryor Sand & Redi-Mix, Inc; 1979-10-16 to current/open; source msha-controller-operator-history