# Relationship history for MSHA mine 3602872

Current hierarchy: **Breslin John → Con Eng Coal Corp Inc → Tracy Vein Strip**

- 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:** John W Butcavage Estate → Tracy Vein Strip; 1970-02-01 to 1976-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Butcavage John W → Tracy Vein Strip; 1970-02-01 to 1976-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Butcavage John W → John W Butcavage Estate; 1970-02-01 to 1976-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Con Eng Coal Corp Inc → Tracy Vein Strip; 1976-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Breslin John → Tracy Vein Strip; 1976-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Breslin John → Con Eng Coal Corp Inc; 1976-10-08 to current/open; source msha-controller-operator-history