# Relationship history for MSHA mine 0100646

Current hierarchy: **Glenn  Ellison → Rock and Stone Sales Inc → Rock and Stone Sales Inc 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Brown Stone Co., Inc → Rock and Stone Sales Inc Quarry; 1950-01-01 to 2008-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Duane  Brown et al → Rock and Stone Sales Inc Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duane  Brown et al → Brown Stone Co., Inc; 1950-01-01 to 2008-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Rock and Stone Sales Inc → Rock and Stone Sales Inc Quarry; 2008-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glenn  Ellison → Rock and Stone Sales Inc Quarry; 2008-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glenn  Ellison → Rock and Stone Sales Inc; 2008-04-10 to current/open; source msha-controller-operator-history