# Relationship history for MSHA mine 4103824

Current hierarchy: **Bryan  Marx → Marx Building Stone Inc → MARX BUILDING 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Marx Building Stone Inc → MARX BUILDING STONE INC.; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryan  Marx → MARX BUILDING STONE INC.; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan  Marx → Marx Building Stone Inc; 1994-07-01 to current/open; source msha-controller-operator-history