# Relationship history for MSHA mine 1900311

Current hierarchy: **Timothy A  Pybus → Georgetown Sand & Gravel Company Inc → GEORGETOWN SAND AND GRAVEL CO, INC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Georgetown Sand & Gravel Company Inc → GEORGETOWN SAND AND GRAVEL CO, INC; 1950-01-01 to 1983-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Vincent  Gould → GEORGETOWN SAND AND GRAVEL CO, INC; 1950-01-01 to 1983-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Gould → Georgetown Sand & Gravel Company Inc; 1950-01-01 to 1983-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Georgetown Sand & Gravel Company Inc → GEORGETOWN SAND AND GRAVEL CO, INC; 1983-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy A  Pybus → GEORGETOWN SAND AND GRAVEL CO, INC; 1983-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy A  Pybus → Georgetown Sand & Gravel Company Inc; 1983-02-22 to current/open; source msha-controller-operator-history