# Relationship history for MSHA mine 0401773

Current hierarchy: **RRM Development Corporation; Mitsubishi Corp → Fourth Street Rock Crusher Inc → FOURTH STREET ROCK CRUSHER**

- 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

- **operator_operates_mine:** Fourth Street Rock Crusher Inc → FOURTH STREET ROCK CRUSHER; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christi Johnson  Bulot → FOURTH STREET ROCK CRUSHER; 1950-01-01 to 2006-01-10; source msha-controller-operator-history
- **controller_controls_operator:** Christi Johnson  Bulot → Fourth Street Rock Crusher Inc; 1950-01-01 to 2006-01-10; source msha-controller-operator-history
- **controller_controls_mine:** Mitsubishi Corp  et al → FOURTH STREET ROCK CRUSHER; 2006-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitsubishi Corp  et al → Fourth Street Rock Crusher Inc; 2006-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RRM Development Corporation et al → Fourth Street Rock Crusher Inc; 2006-01-11 to current/open; source msha-controller-operator-history