# Relationship history for MSHA mine 0405178

Current hierarchy: **Jeff  Hansen → Hansen Bros. Enterprises → Ridge Rock 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:** Jeff  Hansen et al → Ridge Rock Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ridge Rock Quarry → Ridge Rock Quarry; 1992-02-01 to 2020-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Bonelli → Ridge Rock Quarry; 1992-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Bonelli → Ridge Rock Quarry; 1992-02-01 to 2020-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Hansen Bros. Enterprises → Ridge Rock Quarry; 2020-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Hansen et al → Hansen Bros. Enterprises; 2020-08-03 to current/open; source msha-controller-operator-history