# Relationship history for MSHA mine 0200728

Current hierarchy: **George  Vlassis; Peter  Vlassis; Steven  Vlassis → Tri County Materials Inc → Tri County Materials Inc.**

- 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:** W A Morris Sand & Gravel Company Inc → Tri County Materials Inc.; 1950-01-01 to 1983-02-16; source msha-controller-operator-history
- **controller_controls_mine:** W A  Morris → Tri County Materials Inc.; 1950-01-01 to 1983-02-16; source msha-controller-operator-history
- **controller_controls_operator:** W A  Morris → W A Morris Sand & Gravel Company Inc; 1950-01-01 to 1983-02-16; source msha-controller-operator-history
- **operator_operates_mine:** W A Morris Sand & Gravel Company Inc → Tri County Materials Inc.; 1983-02-17 to 2005-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Gilbert III → Tri County Materials Inc.; 1983-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Gilbert III → W A Morris Sand & Gravel Company Inc; 1983-02-17 to 2005-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Tri County Materials Inc → Tri County Materials Inc.; 2005-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew J  Gilbert III → Tri County Materials Inc.; 2005-12-15 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Gilbert III → Tri County Materials Inc; 2005-12-15 to 2015-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Shirley L  Gilbert et al → Tri County Materials Inc.; 2015-10-01 to 2018-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Shirley L  Gilbert et al → Tri County Materials Inc; 2015-10-01 to 2018-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Vlassis et al → Tri County Materials Inc; 2015-10-01 to 2018-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Vlassis → Tri County Materials Inc.; 2018-07-01 to 2024-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Vlassis → Tri County Materials Inc; 2018-07-01 to 2024-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Vlassis et al → Tri County Materials Inc.; 2024-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Vlassis et al → Tri County Materials Inc; 2024-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George  Vlassis et al → Tri County Materials Inc; 2024-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Vlassis et al → Tri County Materials Inc; 2024-09-01 to current/open; source msha-controller-operator-history