# Relationship history for MSHA mine 0504954

Current hierarchy: **RMR Industrials Inc → RMR Aggregates, Inc. → Mid-Continent Quarry**

- 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:** CalX Minerals, LLC → Mid-Continent Quarry; 2010-08-04 to 2016-10-11; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin H  Miller et al → Mid-Continent Quarry; 2010-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin H  Miller et al → CalX Minerals, LLC; 2010-08-04 to 2016-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence M  Mayers Jr et al → CalX Minerals, LLC; 2010-08-04 to 2016-10-11; source msha-controller-operator-history
- **operator_operates_mine:** RMR Aggregates, Inc. → Mid-Continent Quarry; 2016-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** RMR Industrials Inc → Mid-Continent Quarry; 2016-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** RMR Industrials Inc → RMR Aggregates, Inc.; 2016-10-12 to current/open; source msha-controller-operator-history