# Relationship history for MSHA mine 4104715

Current hierarchy: **Robinson Family Management → Austin White Lime Company, Ltd. → Georgetown 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

- **controller_controls_mine:** J.O.  Robinson et al → Georgetown Quarry; 1950-01-01 to 2024-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Austin White Lime Company, Ltd. → Georgetown Quarry; 2008-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J.O.  Robinson et al → Austin White Lime Company, Ltd.; 2008-03-10 to 2024-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Family Management et al → Georgetown Quarry; 2024-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Family Management et al → Austin White Lime Company, Ltd.; 2024-04-25 to current/open; source msha-controller-operator-history