# Relationship history for MSHA mine 1700912

Current hierarchy: **Gregg  Smallwood; Paula  Smallwood → Smallwood Inc → Screening 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:** Smallwood Inc → Screening plant; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregg  Smallwood et al → Screening plant; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregg  Smallwood et al → Smallwood Inc; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paula  Smallwood et al → Smallwood Inc; 2014-10-15 to current/open; source msha-controller-operator-history