# Relationship history for MSHA mine 3401252

Current hierarchy: **Hill J C → J C Hill → Rocky 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:** Cornell Construction Company Inc → Rocky Pit; 1980-03-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cornell L T & John → Rocky Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornell L T & John → Cornell Construction Company Inc; 1980-03-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** J C Hill → Rocky Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hill J C → Rocky Pit; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill J C → J C Hill; 1980-04-01 to current/open; source msha-controller-operator-history