# Relationship history for MSHA mine 2302515

Current hierarchy: **Michael K Farmer; Elliott (Bud) E Farmer → Capital Sand Company, Inc. → Plant #20 - River Bend**

- 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:** Michael K Farmer  et al → Plant #20 - River Bend; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Capital Sand Company, Inc. → Plant #20 - River Bend; 2017-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K Farmer  et al → Capital Sand Company, Inc.; 2017-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elliott (Bud) E Farmer  et al → Capital Sand Company, Inc.; 2017-01-17 to current/open; source msha-controller-operator-history