# Relationship history for MSHA mine 1900689

Current hierarchy: **Bonnie Frances  Gallant; Donald J.   (Sr.)  Gallant → W L Byrne, Inc → W L Byrne, 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:** Byrne Sand & Gravel Co., Inc → W L Byrne, Inc; 1950-01-01 to 2021-10-12; source msha-controller-operator-history
- **controller_controls_mine:** William L  Byrne → W L Byrne, Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William L  Byrne → Byrne Sand & Gravel Co., Inc; 1950-01-01 to 2021-10-12; source msha-controller-operator-history
- **operator_operates_mine:** W L Byrne, Inc → W L Byrne, Inc; 2021-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Susan J Byrne et al → W L Byrne, Inc; 2021-10-31 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Susan J Byrne et al → W L Byrne, Inc; 2021-10-31 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen A Pratt et al → W L Byrne, Inc; 2021-10-31 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie F Gallant et al → W L Byrne, Inc; 2021-10-31 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Donald J.   (Sr.)  Gallant et al → W L Byrne, Inc; 2024-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald J.   (Sr.)  Gallant et al → W L Byrne, Inc; 2024-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bonnie Frances  Gallant et al → W L Byrne, Inc; 2024-02-10 to current/open; source msha-controller-operator-history