# Relationship history for MSHA mine 1901303

Current hierarchy: **Anthony  Ciaramitaro → Granite Design Stone Masonry → Johnson 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

- **operator_operates_mine:** Granite Design Stone Masonry → Johnson Quarry; 2021-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anthony  Ciaramitaro → Johnson Quarry; 2021-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  Ciaramitaro → Granite Design Stone Masonry; 2021-12-06 to current/open; source msha-controller-operator-history