# Relationship history for MSHA mine 2200707

Current hierarchy: **Richard W  Ladner → Twin L Construction, Inc. → Twin L 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:** Twin L Construction, Inc → Twin L Pit; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard W  Ladner → Twin L Pit; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard W  Ladner → Twin L Construction, Inc; 1999-03-01 to current/open; source msha-controller-operator-history