# Relationship history for MSHA mine 4600048

Current hierarchy: **William  Snyder; David  Snyder → R B S Inc → Savannah Lane 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:** Savannah Lane Quarry-Div/Princess Coals Inc → Savannah Lane Quarry; 1950-01-01 to 1985-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Underwood Cecil → Savannah Lane Quarry; 1950-01-01 to 1985-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Underwood Cecil → Savannah Lane Quarry-Div/Princess Coals Inc; 1950-01-01 to 1985-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Ronald B  Snyder → Savannah Lane Quarry; 1950-01-01 to 2022-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Ryder Willie A → Savannah Lane Quarry; 1984-05-01 to 1989-07-20; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Contracting Inc → Savannah Lane Quarry; 1985-02-27 to 1989-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Ryder Willie A → R & R Coal Contracting Inc; 1985-02-27 to 1989-07-20; source msha-controller-operator-history
- **operator_operates_mine:** R B S Inc → Savannah Lane Quarry; 1989-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald B  Snyder → R B S Inc; 1989-07-21 to 2022-01-17; source msha-controller-operator-history
- **controller_controls_mine:** David  Snyder et al → Savannah Lane Quarry; 2022-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Snyder et al → R B S Inc; 2022-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Snyder et al → R B S Inc; 2022-01-18 to current/open; source msha-controller-operator-history