# Relationship history for MSHA mine 3607639

Current hierarchy: **Troy  Adzima → Lakeland Aggregates, Inc. → Portable Wash Plant III**

- 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:** Gary  Hoover → Portable Wash Plant III; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hoover Sand & Gravel Company Inc → Portable Wash Plant III; 1984-08-01 to 2006-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Hoover → Hoover Sand & Gravel Company Inc; 1984-08-01 to 2006-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Lakeland Aggregates, Inc. → Portable Wash Plant III; 2006-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy  Adzima → Portable Wash Plant III; 2006-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Adzima → Lakeland Aggregates, Inc.; 2006-06-13 to current/open; source msha-controller-operator-history