# Relationship history for MSHA mine 2700453

Current hierarchy: **Raymond J  Johnson → R&D Trucking Co. → R&D Trucking Co.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** R&D Trucking Co. → R&D Trucking Co.; 2012-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond J  Johnson → R&D Trucking Co.; 2012-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond J  Johnson → R&D Trucking Co.; 2012-04-19 to current/open; source msha-controller-operator-history