# Relationship history for MSHA mine 4202121

Current hierarchy: **Robert J Hicken; Paul R Ballif → Mountain Valley Stone, Inc. → Mountain Valley Stone 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

- **controller_controls_mine:** Jon R  Young → Mountain Valley Stone Inc; 1995-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Young Stone Masonry → Mountain Valley Stone Inc; 1996-01-01 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Jon R  Young → Young Stone Masonry; 1996-01-01 to 1999-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Valley Stone, Inc. → Mountain Valley Stone Inc; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert J Hicken et al → Mountain Valley Stone Inc; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J Hicken et al → Mountain Valley Stone, Inc.; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul R Ballif et al → Mountain Valley Stone, Inc.; 1999-06-01 to current/open; source msha-controller-operator-history