# Relationship history for MSHA mine 3400027

Current hierarchy: **Adams Affiliates Incorporated → Hydro Quarry, LLC → Hydro 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:** Hodges Trucking Company Inc → Hydro Quarry; 1981-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Phearson Stone Quarry → Hydro Quarry; 1984-07-01 to 1991-05-27; source msha-controller-operator-history
- **controller_controls_mine:** John W  Mc Phearson → Hydro Quarry; 1984-07-01 to 1991-05-27; source msha-controller-operator-history
- **controller_controls_operator:** John W  Mc Phearson → Mc Phearson Stone Quarry; 1984-07-01 to 1991-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Western Plains Materials → Hydro Quarry; 1991-05-28 to 2012-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Hodges Trucking Company Inc → Western Plains Materials; 1991-05-28 to 2012-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Hydro Quarry, LLC → Hydro Quarry; 2012-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams Affiliates Incorporated → Hydro Quarry; 2012-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Affiliates Incorporated → Hydro Quarry, LLC; 2012-06-12 to current/open; source msha-controller-operator-history