# Relationship history for MSHA mine 3610448

Current hierarchy: **James J  Svonavec → J & J Svonavec Excavating, Inc. → Hart Mine**

- 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:** James J  Svonavec et al → Hart Mine; 2011-05-20 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_mine:** James J  Svonavec → Hart Mine; 2023-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & J Svonavec Excavating, Inc. → Hart Mine; 2024-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James J  Svonavec et al → J & J Svonavec Excavating, Inc.; 2024-06-26 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_operator:** John J  Svonavec et al → J & J Svonavec Excavating, Inc.; 2024-06-26 to 2023-09-30; source msha-controller-operator-history
- **controller_controls_operator:** James J  Svonavec → J & J Svonavec Excavating, Inc.; 2024-06-26 to current/open; source msha-controller-operator-history