# Relationship history for MSHA mine 3503851

Current hierarchy: **Robert  Leininger → R & L Excavating, Inc. → Plant 2**

- 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:** Robert  Leininger → Plant 2; 2015-05-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & L Excavating, Inc. → Plant 2; 2016-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Leininger → R & L Excavating, Inc.; 2016-08-03 to current/open; source msha-controller-operator-history