# Relationship history for MSHA mine 4102392

Current hierarchy: **Ivan D  Barry → Barry Industrial Sand, Inc → Barry Industrial Sand, 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Smith Material Corp Of Beaumont → Barry Industrial Sand, Inc.; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** B Curtis  Smith → Barry Industrial Sand, Inc.; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_operator:** B Curtis  Smith → Smith Material Corp Of Beaumont; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Barry Industrial Sand, Inc → Barry Industrial Sand, Inc.; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ivan D  Barry → Barry Industrial Sand, Inc.; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ivan D  Barry → Barry Industrial Sand, Inc; 1992-07-01 to current/open; source msha-controller-operator-history