# Relationship history for MSHA mine 2003268

Current hierarchy: **Daniel C  Timmer → Riverfront Sand & Redi-Mix Inc → Riverfront Sand & Redi-Mix - Edson Pit**

- 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:** Riverfront Sand & Redi-Mix Inc → Riverfront Sand & Redi-Mix - Edson Pit; 2003-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Timmer et al → Riverfront Sand & Redi-Mix - Edson Pit; 2003-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Timmer et al → Riverfront Sand & Redi-Mix Inc; 2003-04-30 to current/open; source msha-controller-operator-history