# Relationship history for MSHA mine 3000839

Current hierarchy: **Colas S A → Upstone Materials Inc. → PORTABLE SCREENING PLANT #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

- **controller_controls_mine:** Graymont Ltd → PORTABLE SCREENING PLANT #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Materials Inc → PORTABLE SCREENING PLANT #1; 1950-01-01 to 1982-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Hague Peter R → PORTABLE SCREENING PLANT #1; 1950-01-01 to 1986-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Hague Peter R → Concrete Materials Inc; 1950-01-01 to 1982-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Plattsburgh Quarries → PORTABLE SCREENING PLANT #1; 1982-10-21 to 2004-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Plattsburgh Quarries; 1982-10-21 to 2004-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → PORTABLE SCREENING PLANT #1; 2004-06-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Graymont Materials (NY) Inc. → PORTABLE SCREENING PLANT #1; 2004-07-06 to 2017-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont Materials (NY) Inc.; 2004-07-06 to 2017-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → PORTABLE SCREENING PLANT #1; 2017-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Upstone Materials Inc. → PORTABLE SCREENING PLANT #1; 2017-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Upstone Materials Inc.; 2017-06-05 to current/open; source msha-controller-operator-history