# Relationship history for MSHA mine 1102545

Current hierarchy: **Robert A  Egert → Renner Quarries, Ltd. → Robbins 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:** Renner Quarries, Ltd. → Robbins Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Egert et al → Robbins Quarry; 1950-01-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Egert et al → Renner Quarries, Ltd.; 1950-01-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Egert et al → Renner Quarries, Ltd.; 1950-01-01 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Egert → Robbins Quarry; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Egert → Renner Quarries, Ltd.; 2024-08-01 to current/open; source msha-controller-operator-history