# Relationship history for MSHA mine 4603071

Current hierarchy: **Eugene H  Williams → Romney Stone Quarry Inc → ROMNEY QUARRY AND MILL**

- 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:** Aurora Stone Company Inc → ROMNEY QUARRY AND MILL; 1950-01-01 to 1988-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Glenn O  Fint → ROMNEY QUARRY AND MILL; 1950-01-01 to 1989-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Glenn O  Fint → Aurora Stone Company Inc; 1950-01-01 to 1988-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Romney Stone Quarry Inc → ROMNEY QUARRY AND MILL; 1988-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eugene H  Williams → ROMNEY QUARRY AND MILL; 1988-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene H  Williams → Romney Stone Quarry Inc; 1988-07-15 to current/open; source msha-controller-operator-history