# Relationship history for MSHA mine 1302483

Current hierarchy: **Bill  Yohn; Laura  Yohn; Alex  Yohn → Wright Materials → Airport 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:** Wright Materials → Airport Pit; 2020-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Yohn et al → Airport Pit; 2020-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Yohn et al → Wright Materials; 2020-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex  Yohn et al → Wright Materials; 2020-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laura  Yohn et al → Wright Materials; 2020-02-06 to current/open; source msha-controller-operator-history