# Relationship history for MSHA mine 3606710

Current hierarchy: **Fred  Runco; James  Yenzi → R & L Coal Corp → R & L Strip**

- 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:** R & L Coal Corp → R & L Strip; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Runco et al → R & L Strip; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Runco et al → R & L Coal Corp; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Yenzi et al → R & L Coal Corp; 1978-07-01 to current/open; source msha-controller-operator-history