# Relationship history for MSHA mine 1700921

Current hierarchy: **Steve  McGee → Steve McGee Construction LLC → Astec/JCI Mobile Screen**

- 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

- **controller_controls_mine:** Steve  McGee → Astec/JCI Mobile Screen; 2001-10-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steve McGee Construction LLC → Astec/JCI Mobile Screen; 2013-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  McGee → Steve McGee Construction LLC; 2013-10-29 to current/open; source msha-controller-operator-history