# Relationship history for MSHA mine 0203443

Current hierarchy: **Russ  Myers → RMC Mining Deveopment → Blue Bell 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:** RMC Mining Deveopment → Blue Bell Mine; 2021-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russ  Myers → Blue Bell Mine; 2021-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russ  Myers → RMC Mining Deveopment; 2021-03-03 to current/open; source msha-controller-operator-history