# Relationship history for MSHA mine 1701060

Current hierarchy: **Robert Henry  Higgins → HA HIGGINS and SON INC → portable plant**

- 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:** HA HIGGINS and SON INC → portable plant; 2022-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert Henry  Higgins → portable plant; 2022-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Henry  Higgins → HA HIGGINS and SON INC; 2022-03-31 to current/open; source msha-controller-operator-history