# Relationship history for MSHA mine 2101652

Current hierarchy: **Ronald R  Hansen → Hansen Gravel & Fill → Jergens Pit & Mill**

- 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

- **operator_operates_mine:** Gil Boldt Gravel & Fill → Jergens Pit & Mill; 1950-01-01 to 1980-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Boldt Gil → Jergens Pit & Mill; 1950-01-01 to 1980-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Boldt Gil → Gil Boldt Gravel & Fill; 1950-01-01 to 1980-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Hansen Gravel & Fill → Jergens Pit & Mill; 1980-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald R  Hansen → Jergens Pit & Mill; 1980-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald R  Hansen → Hansen Gravel & Fill; 1980-09-04 to current/open; source msha-controller-operator-history