# Relationship history for MSHA mine 4601726

Current hierarchy: **Lambert Julius → Wyoming Coal Mining Company → Wyoming No 1 Mine**

- 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

- **controller_controls_mine:** Carroll Preston W → Wyoming No 1 Mine; 1950-01-01 to 1977-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Mining Company Inc → Wyoming No 1 Mine; 1950-01-01 to 1974-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kee Ralph → Wyoming No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kee Ralph → Wyoming Mining Company Inc; 1950-01-01 to 1974-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Coal Mining Company → Wyoming No 1 Mine; 1974-09-02 to 1977-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Preston W → Wyoming Coal Mining Company; 1974-09-02 to 1977-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Coal Mining Company → Wyoming No 1 Mine; 1977-01-06 to 1979-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Mullens Gale & Ariland Steele → Wyoming No 1 Mine; 1977-01-06 to 1979-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Mullens Gale & Ariland Steele → Wyoming Coal Mining Company; 1977-01-06 to 1979-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Coal Mining Company → Wyoming No 1 Mine; 1979-03-14 to 1980-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Mullens Gale & Sherman Caudill → Wyoming No 1 Mine; 1979-03-14 to 1980-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Mullens Gale & Sherman Caudill → Wyoming Coal Mining Company; 1979-03-14 to 1980-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Wyoming Coal Mining Company → Wyoming No 1 Mine; 1980-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Julius → Wyoming No 1 Mine; 1980-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Julius → Wyoming Coal Mining Company; 1980-03-14 to current/open; source msha-controller-operator-history