# Relationship history for MSHA mine 4104650

Current hierarchy: **Jack L  Smithwick → Georgetown Stone → Jacks Pit #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Jack L  Smithwick → Jacks Pit #2; 1994-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgetown Stone → Jacks Pit #2; 2007-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack L  Smithwick → Georgetown Stone; 2007-03-05 to current/open; source msha-controller-operator-history