# Relationship history for MSHA mine 0401807

Current hierarchy: **Robar Enterprises Inc → Hi-Grade Materials → ROBERT E HOVE PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Granite Construction Inc → ROBERT E HOVE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hi Desert Concrete Products Inc → ROBERT E HOVE PIT; 1950-01-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wade  Ellis → ROBERT E HOVE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wade  Ellis → Hi Desert Concrete Products Inc; 1950-01-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Robar Enterprises Inc → ROBERT E HOVE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → ROBERT E HOVE PIT; 1986-12-27 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac California Inc → ROBERT E HOVE PIT; 1989-07-01 to 1992-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac California Inc; 1989-07-01 to 1992-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → ROBERT E HOVE PIT; 1992-06-22 to 2013-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1992-06-22 to 2013-12-26; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Grade Materials → ROBERT E HOVE PIT; 2013-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robar Enterprises Inc → Hi-Grade Materials; 2013-12-27 to current/open; source msha-controller-operator-history