# Relationship history for MSHA mine 1900306

Current hierarchy: **Fantasia Louis M → F & G Sand & Gravel Company Inc → F & G Sand And Gravel Company Incorporat**

- 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:** F & G Sand & Gravel Company Inc → F & G Sand And Gravel Company Incorporat; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fantasia Louis M → F & G Sand And Gravel Company Incorporat; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fantasia Louis M → F & G Sand & Gravel Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history