# Relationship history for MSHA mine 0401770

Current hierarchy: **Frank  Dutra → Nor-Cal Recycled Rock & Aggregates, Inc. → Ford Gravel**

- 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 → Ford Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ford Gravel Company Inc → Ford Gravel; 1950-01-01 to 1984-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Walsh → Ford Gravel; 1950-01-01 to 1984-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Walsh → Ford Gravel Company Inc; 1950-01-01 to 1984-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Ford Gravel Company Inc → Ford Gravel; 1984-07-11 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert J  King → Ford Gravel; 1984-07-11 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  King → Ford Gravel Company Inc; 1984-07-11 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_mine:** C Dean  Rasmussen → Ford Gravel; 1995-07-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Parnum Paving,  Inc. → Ford Gravel; 1995-09-12 to 2002-05-31; source msha-controller-operator-history
- **controller_controls_operator:** C Dean  Rasmussen → Parnum Paving,  Inc.; 1995-09-12 to 2002-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Co → Ford Gravel; 2002-06-01 to 2014-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Co; 2002-06-01 to 2014-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Dutra et al → Ford Gravel; 2003-05-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nor-Cal Recycled Rock & Aggregates, Inc. → Ford Gravel; 2014-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Dutra et al → Nor-Cal Recycled Rock & Aggregates, Inc.; 2014-08-28 to current/open; source msha-controller-operator-history