# Relationship history for MSHA mine 2102498

Current hierarchy: **Lawrence  Lundin → Lundin Construction Company Of Cromwell → Mel Johnson 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:** Johnson Trucking Company → Mel Johnson Pit; 1950-01-01 to 1978-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Trucking Company → Mel Johnson Pit; 1950-01-01 to 1978-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Trucking Company → Johnson Trucking Company; 1950-01-01 to 1978-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence  Lundin → Mel Johnson Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lundin Construction Company Of Cromwell → Mel Johnson Pit; 1978-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence  Lundin → Lundin Construction Company Of Cromwell; 1978-07-28 to current/open; source msha-controller-operator-history