# Relationship history for MSHA mine 4300064

Current hierarchy: **Stephen M  Chmielewski → TROY MINERALS → WALLINGFORD 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

- **operator_operates_mine:** White Pigment Corp → WALLINGFORD QUARRY; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Mines Corp → WALLINGFORD QUARRY; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Mines Corp → White Pigment Corp; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Dennis R  Demers → WALLINGFORD QUARRY; 1950-01-01 to 2017-04-30; source msha-controller-operator-history
- **operator_operates_mine:** White Pigment Corp → WALLINGFORD QUARRY; 1980-09-22 to 1985-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Minerals Corp & Pluess-Staufer Industries → WALLINGFORD QUARRY; 1980-09-22 to 1987-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Minerals Corp & Pluess-Staufer Industries → White Pigment Corp; 1980-09-22 to 1985-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Shelburne Limestone Corp → WALLINGFORD QUARRY; 1985-06-26 to 2015-01-04; source msha-controller-operator-history
- **controller_controls_operator:** Dennis R  Demers → Shelburne Limestone Corp; 1985-06-26 to 2015-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Chmielewski → WALLINGFORD QUARRY; 1995-03-01 to 2025-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Troy Minerals → WALLINGFORD QUARRY; 2015-01-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Chmielewski → Troy Minerals; 2015-01-05 to 2025-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Trampas  Demers → WALLINGFORD QUARRY; 2017-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trampas  Demers → Shelburne Limestone Corp; 2017-05-01 to 2015-01-04; source msha-controller-operator-history
- **controller_controls_mine:** Stephen M  Chmielewski → WALLINGFORD QUARRY; 2025-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen M  Chmielewski → Troy Minerals; 2025-06-30 to current/open; source msha-controller-operator-history