# Relationship history for MSHA mine 4603351

Current hierarchy: **Ferguson Ronald P → C & E Tipple Inc → Glen Alum Tipple**

- 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:** Oak Leaf Coal Co → Glen Alum Tipple; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Oak Leaf Coal Co → Glen Alum Tipple; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Oak Leaf Coal Co → Oak Leaf Coal Co; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Greenberg Phillip M → Glen Alum Tipple; 1974-10-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp → Glen Alum Tipple; 1975-04-02 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Greenberg Phillip M → Energy Development Corp; 1975-04-02 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → Glen Alum Tipple; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp → Glen Alum Tipple; 1976-11-01 to 1981-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Energy Development Corp; 1976-11-01 to 1981-11-01; source msha-controller-operator-history
- **operator_operates_mine:** C & E Tipple Inc → Glen Alum Tipple; 1981-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ferguson Ronald P → Glen Alum Tipple; 1981-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson Ronald P → C & E Tipple Inc; 1981-11-02 to current/open; source msha-controller-operator-history