# Relationship history for MSHA mine 3102292

Current hierarchy: **Donald T  Oldham → Sanford Contractors, Inc. → River Road Sand Mine**

- 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:** Sanford Contractors, Inc. → River Road Sand Mine; 2014-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald T  Oldham → River Road Sand Mine; 2014-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald T  Oldham → Sanford Contractors, Inc.; 2014-07-14 to current/open; source msha-controller-operator-history