# Relationship history for MSHA mine 4103524

Current hierarchy: **Mitchell Bryan & Nelson → River Bend Materials Inc → River Bend Materials Incorporated**

- 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:** Newell & Newell Materials Inc → River Bend Materials Incorporated; 1988-06-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Newell Kenneth B & David R → River Bend Materials Incorporated; 1988-06-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Newell Kenneth B & David R → Newell & Newell Materials Inc; 1988-06-01 to 1989-12-31; source msha-controller-operator-history
- **operator_operates_mine:** River Bend Materials Inc → River Bend Materials Incorporated; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell Bryan & Nelson → River Bend Materials Incorporated; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Bryan & Nelson → River Bend Materials Inc; 1990-01-01 to current/open; source msha-controller-operator-history