# Relationship history for MSHA mine 2302162

Current hierarchy: **Michael K Farmer; Elliott (Bud) E Farmer → Capital Sand Company Inc → Rolla Plant  #13**

- 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:** Elliott (Bud) E Farmer  et al → Rolla Plant  #13; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Webber Sand & Gravel → Rolla Plant  #13; 1997-09-01 to 2003-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Webber → Rolla Plant  #13; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Webber → Webber Sand & Gravel; 1997-09-01 to 2003-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Capital Sand Company Inc → Rolla Plant  #13; 2003-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott (Bud) E Farmer  et al → Capital Sand Company Inc; 2003-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K Farmer  et al → Capital Sand Company Inc; 2003-03-24 to current/open; source msha-controller-operator-history