# Relationship history for MSHA mine 3002402

Current hierarchy: **Joseph  Spezio → Regional Sand & Gravel Inc → Macedon Plant**

- 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:** S-S Gravel Operation → Macedon Plant; 1979-01-01 to 1983-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Siebert Harvey E & Joseph Spezio → Macedon Plant; 1979-01-01 to 1983-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Siebert Harvey E & Joseph Spezio → S-S Gravel Operation; 1979-01-01 to 1983-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Regional Gravel Products Inc → Macedon Plant; 1983-01-19 to 1986-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Palmer B J → Macedon Plant; 1983-01-19 to 1986-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Palmer B J → Regional Gravel Products Inc; 1983-01-19 to 1986-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Regional Sand & Gravel Inc → Macedon Plant; 1986-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Spezio → Macedon Plant; 1986-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezio → Regional Sand & Gravel Inc; 1986-11-03 to current/open; source msha-controller-operator-history