# Relationship history for MSHA mine 3003076

Current hierarchy: **Carolyn M.  Trudeau → Trudeau Sand & Gravel Inc → BARTLETT CARRY 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Richard A  Trudeau → BARTLETT CARRY PIT; 1950-01-01 to 2022-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Trudeau Sand & Gravel Inc → BARTLETT CARRY PIT; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Trudeau → Trudeau Sand & Gravel Inc; 1993-06-01 to 2022-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Carolyn M.  Trudeau → BARTLETT CARRY PIT; 2022-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carolyn M.  Trudeau → Trudeau Sand & Gravel Inc; 2022-10-02 to current/open; source msha-controller-operator-history