# Relationship history for MSHA mine 0401946

Current hierarchy: **Peter  Shea Jr → J F Shea Co Inc → Shea Sand & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** J F Shea Co Inc → Shea Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John F  Shea → Shea Sand & Gravel; 1950-01-01 to 2024-10-21; source msha-controller-operator-history
- **controller_controls_operator:** John F  Shea → J F Shea Co Inc; 1950-01-01 to 2024-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Shea Jr → Shea Sand & Gravel; 2024-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Shea Jr → J F Shea Co Inc; 2024-10-22 to current/open; source msha-controller-operator-history