# Relationship history for MSHA mine 2900444

Current hierarchy: **Raymond  Gutierrez → Ray'S Sand & Gravel → Vallejos Mine**

- 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:** Duke City Gravel Products → Vallejos Mine; 1950-01-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Mrs Horace  Stockton → Vallejos Mine; 1950-01-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Mrs Horace  Stockton → Duke City Gravel Products; 1950-01-01 to 1980-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Ray'S Sand & Gravel → Vallejos Mine; 1980-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Gutierrez → Vallejos Mine; 1980-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Gutierrez → Ray'S Sand & Gravel; 1980-03-20 to current/open; source msha-controller-operator-history