# Relationship history for MSHA mine 0102947

Current hierarchy: **Changyung  Tan → TBGS Quarry, LLC. → Sylacauga Marble, Mine #1**

- 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:** Purple Mountain Marble Company Inc → Sylacauga Marble, Mine #1; 1992-03-01 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Bernard  Strauss → Sylacauga Marble, Mine #1; 1992-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernard  Strauss → Purple Mountain Marble Company Inc; 1992-03-01 to 1998-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Alabama Marble Co Inc → Sylacauga Marble, Mine #1; 1998-11-04 to 2014-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Musolino → Sylacauga Marble, Mine #1; 1998-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Musolino → Alabama Marble Co Inc; 1998-11-04 to 2014-11-23; source msha-controller-operator-history
- **operator_operates_mine:** TBGS Quarry, LLC. → Sylacauga Marble, Mine #1; 2014-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy  Swindal et al → Sylacauga Marble, Mine #1; 2014-11-24 to 2017-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Swindal et al → TBGS Quarry, LLC.; 2014-11-24 to 2017-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Changyung  Tan → Sylacauga Marble, Mine #1; 2017-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Changyung  Tan → TBGS Quarry, LLC.; 2017-08-01 to current/open; source msha-controller-operator-history