# Relationship history for MSHA mine 4503734

Current hierarchy: **Patrick J  Michielli → Circle M Construction and Land → Circle M Construction and Landscape**

- 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:** S.R. Sicilia, Inc. → Circle M Construction and Landscape; 2015-03-23 to 2017-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Gregory R  Sicilia → Circle M Construction and Landscape; 2015-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory R  Sicilia → S.R. Sicilia, Inc.; 2015-03-23 to 2017-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Circle M Construction and Land → Circle M Construction and Landscape; 2017-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patrick J  Michielli → Circle M Construction and Landscape; 2017-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick J  Michielli → Circle M Construction and Land; 2017-09-01 to current/open; source msha-controller-operator-history