# Relationship history for MSHA mine 1800262

Current hierarchy: **Carl Del Signore Family Trust → Upperman Coal Company → No 3 Pit**

- 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:** Upperman Coal Company → No 3 Pit; 1950-01-01 to 1978-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Upperman Wilbur → No 3 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Upperman Wilbur → Upperman Coal Company; 1950-01-01 to 1978-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Upperman Coal Company → No 3 Pit; 1978-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl Del Signore Family Trust → No 3 Pit; 1978-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl Del Signore Family Trust → Upperman Coal Company; 1978-11-27 to current/open; source msha-controller-operator-history