# Relationship history for MSHA mine 2602204

Current hierarchy: **Granite Construction Inc → Granite Construction Company → Lockwood Quarry**

- 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:** Granite Construction Inc → Lockwood Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blaine J  Rees → Lockwood Quarry; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rees'S Enterprise → Lockwood Quarry; 1992-05-01 to 1994-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Blaine J  Rees → Rees'S Enterprise; 1992-05-01 to 1994-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Lockwood Quarry; 1994-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1994-03-20 to current/open; source msha-controller-operator-history