# Relationship history for MSHA mine 4801049

Current hierarchy: **United Companies → Eagle Engineering Company Inc → Lisco 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

- **controller_controls_mine:** United Companies → Lisco Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Recluse Construction Company → Lisco Pit; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Smith Vernon G → Lisco Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Vernon G → Recluse Construction Company; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Engineering Company Inc → Lisco Pit; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United Companies → Eagle Engineering Company Inc; 1979-06-01 to current/open; source msha-controller-operator-history