# Relationship history for MSHA mine 3607115

Current hierarchy: **Rapp Howard C → Cambria Processing Company Inc → Trent Enterprises Inc**

- 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:** Joe (John J)  Childress et al → Trent Enterprises Inc; 1980-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Joe Childress Inc → Trent Enterprises Inc; 1981-04-01 to 1981-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Joe (John J)  Childress et al → Joe Childress Inc; 1981-04-01 to 1981-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Catherine  Childress et al → Joe Childress Inc; 1981-04-01 to 1981-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Cambria Processing Company Inc → Trent Enterprises Inc; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rapp Howard C → Trent Enterprises Inc; 1981-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rapp Howard C → Cambria Processing Company Inc; 1981-05-19 to current/open; source msha-controller-operator-history