# Relationship history for MSHA mine 4102663

Current hierarchy: **Fred H  Brown → Fort Worth Crushed Stone Inc → CRESSON PIT**

- 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:** Fort Worth Crushed Stone Inc → CRESSON PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred H  Brown → CRESSON PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred H  Brown → Fort Worth Crushed Stone Inc; 1950-01-01 to current/open; source msha-controller-operator-history