# Relationship history for MSHA mine 3003099

Current hierarchy: **Scott David Polaro → Polaro Sand & Gravel Inc → Route 74 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:** George  Rifenburg et al → Route 74 Pit; 1990-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rifenburg Construction Inc → Route 74 Pit; 1993-10-01 to 2026-03-25; source msha-controller-operator-history
- **controller_controls_operator:** George  Rifenburg et al → Rifenburg Construction Inc; 1993-10-01 to 2026-03-25; source msha-controller-operator-history
- **controller_controls_operator:** John K  Rifenburg et al → Rifenburg Construction Inc; 1993-10-01 to 2026-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Scott David Polaro → Route 74 Pit; 2022-12-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Polaro Sand & Gravel Inc → Route 74 Pit; 2026-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott David Polaro → Polaro Sand & Gravel Inc; 2026-03-26 to current/open; source msha-controller-operator-history