# Relationship history for MSHA mine 1900016

Current hierarchy: **John L  Le Masurier; Stephen  LeMasurier → LeMasurier Granite Quarry Inc → LeMasurier Granite Quarry,  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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** LeMasurier Granite Quarry Inc → LeMasurier Granite Quarry,  Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John L  Le Masurier et al → LeMasurier Granite Quarry,  Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Le Masurier et al → LeMasurier Granite Quarry Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  LeMasurier et al → LeMasurier Granite Quarry Inc; 1950-01-01 to current/open; source msha-controller-operator-history