# Relationship history for MSHA mine 4604180

Current hierarchy: **Rag Aktiengesellschaft → Energy Development Corp → Energy No 4**

- 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:** I & S Coal Company Inc → Energy No 4; 1974-05-20 to 1975-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Icenhour Charles → Energy No 4; 1974-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Icenhour Charles → I & S Coal Company Inc; 1974-05-20 to 1975-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Greenberg Phillip M → Energy No 4; 1974-10-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp → Energy No 4; 1975-05-20 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Greenberg Phillip M → Energy Development Corp; 1975-05-20 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Rag Aktiengesellschaft → Energy No 4; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Development Corp → Energy No 4; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rag Aktiengesellschaft → Energy Development Corp; 1976-11-01 to current/open; source msha-controller-operator-history