# Relationship history for MSHA mine 4202747

Current hierarchy: **Susan  Johnson; Robert  Johnson → R.A. Johnson Excavating INC → Johnsons Mine**

- 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.A. Johnson Excavating INC → Johnsons Mine; 2023-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Johnson et al → Johnsons Mine; 2023-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Johnson et al → R.A. Johnson Excavating INC; 2023-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Johnson et al → R.A. Johnson Excavating INC; 2023-04-26 to current/open; source msha-controller-operator-history