# Relationship history for MSHA mine 2003190

Current hierarchy: **Daniel C  Timmer → RIVERFRONT REDI-MIX, INC. → RIVERFRONT GRAVEL PLANT**

- 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

- **operator_operates_mine:** Bob-O-Link-Associates Llc → RIVERFRONT GRAVEL PLANT; 2001-03-01 to 2021-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Timmer et al → RIVERFRONT GRAVEL PLANT; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Timmer et al → Bob-O-Link-Associates Llc; 2001-03-01 to 2021-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Timmer et al → RIVERFRONT GRAVEL PLANT; 2003-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** RIVERFRONT REDI-MIX INC → RIVERFRONT GRAVEL PLANT; 2021-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Timmer et al → RIVERFRONT REDI-MIX INC; 2021-04-01 to current/open; source msha-controller-operator-history