# Relationship history for MSHA mine 4201647

Current hierarchy: **Graymont Ltd → Graymont Western US Inc → Cricket Mountain Plant & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Continental Lime Inc → Cricket Mountain Plant & Quarry; 1980-01-01 to 1989-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Steel Brothers Canada Ltd → Cricket Mountain Plant & Quarry; 1980-01-01 to 1991-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Steel Brothers Canada Ltd → Continental Lime Inc; 1980-01-01 to 1989-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → Cricket Mountain Plant & Quarry; 1989-06-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Graymont Western US Inc → Cricket Mountain Plant & Quarry; 1989-09-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont Western US Inc; 1989-09-25 to current/open; source msha-controller-operator-history