# Relationship history for MSHA mine 4300617

Current hierarchy: **Monica J  Gawet → Tennessee Marble Co dba Champlain Black Marble Co → Champlain Black 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:** Monica J  Gawet → Champlain Black Quarry; 1997-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Champlain Black Marble Co., LLC → Champlain Black Quarry; 2004-08-07 to 2022-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Monica J  Gawet → Champlain Black Quarry; 2004-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monica J  Gawet → Champlain Black Marble Co., LLC; 2004-08-07 to 2022-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Marble Co dba Champlain Black Marble Co → Champlain Black Quarry; 2022-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monica J  Gawet → Tennessee Marble Co dba Champlain Black Marble Co; 2022-09-05 to current/open; source msha-controller-operator-history