# Relationship history for MSHA mine 2103910

Current hierarchy: **Joe  Bushman → Joe Bushman → Ken Bushman**

- 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:** Ken Bushman → Ken Bushman; 2017-06-07 to 2026-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Ken  Bushman → Ken Bushman; 2017-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Bushman → Ken Bushman; 2017-06-07 to 2026-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Joe Bushman → Ken Bushman; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe  Bushman → Ken Bushman; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Bushman → Joe Bushman; 2026-08-12 to current/open; source msha-controller-operator-history