# Relationship history for MSHA mine 4201557

Current hierarchy: **Black Calvin → Calvin Black Enterprises → Exchecquer**

- 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:** Black Calvin → Exchecquer; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shumway Lyman Et Al → Exchecquer; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & D Mining → Exchecquer; 1979-01-01 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Goode Donnie-Kenneth & Truman → Exchecquer; 1979-01-01 to 1980-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Goode Donnie-Kenneth & Truman → T & D Mining; 1979-01-01 to 1980-05-31; source msha-controller-operator-history
- **operator_operates_mine:** M E Mining Company → Exchecquer; 1980-06-01 to 1981-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Lyman Et Al → M E Mining Company; 1980-06-01 to 1981-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Calvin Black Enterprises → Exchecquer; 1981-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Black Calvin → Calvin Black Enterprises; 1981-04-04 to current/open; source msha-controller-operator-history