# Relationship history for MSHA mine 2500346

Current hierarchy: **Mike  Arps → Arps Gravel & Concrete Inc → Arps Gravel & Concrete Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Mike  Arps  et al → Arps Gravel & Concrete Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Woods Brothers Inc → Arps Gravel & Concrete Incorporated; 1950-01-01 to 1988-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Woods Fred → Arps Gravel & Concrete Incorporated; 1950-01-01 to 1988-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Woods Fred → Woods Brothers Inc; 1950-01-01 to 1988-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Arps Gravel & Concrete Inc → Arps Gravel & Concrete Incorporated; 1988-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Arps  et al → Arps Gravel & Concrete Inc; 1988-07-13 to current/open; source msha-controller-operator-history