# Relationship history for MSHA mine 4103938

Current hierarchy: **Mary  Fulton → Brazos Valley Sand & Gravel Inc → PERRIN**

- 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

- **controller_controls_mine:** Mary  Fulton → PERRIN; 1995-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brazos Valley Sand & Gravel Inc → PERRIN; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Fulton → Brazos Valley Sand & Gravel Inc; 1997-03-01 to current/open; source msha-controller-operator-history