# Relationship history for MSHA mine 3604708

Current hierarchy: **James  Adzima → Lakeland Sand & Gravel, Inc. → Lakeland Sand & Gravel, Inc**

- 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

- **operator_operates_mine:** Atlas Sand & Gravel Inc → Lakeland Sand & Gravel, Inc; 1950-01-01 to 1986-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Ronald R  Arnold → Lakeland Sand & Gravel, Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald R  Arnold → Atlas Sand & Gravel Inc; 1950-01-01 to 1986-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Lakeland Sand & Gravel, Inc. → Lakeland Sand & Gravel, Inc; 1986-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Adzima → Lakeland Sand & Gravel, Inc; 1986-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Adzima → Lakeland Sand & Gravel, Inc.; 1986-03-18 to current/open; source msha-controller-operator-history