# Relationship history for MSHA mine 1100408

Current hierarchy: **Ryan Matthew J → P W Ryan Sons Inc → Brown Quarry**

- 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:** Ryan Matthew J → Brown Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P W Ryan Sons Inc → Brown Quarry; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan Matthew J → P W Ryan Sons Inc; 1981-09-01 to current/open; source msha-controller-operator-history