# Relationship history for MSHA mine 4604134

Current hierarchy: **Curtis Rodney L → Chieftain Coal Sales Inc → Chieftain #1**

- 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:** Lobar Tippling Corp → Chieftain #1; 1974-04-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Barr Lloyd → Chieftain #1; 1974-04-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Barr Lloyd → Lobar Tippling Corp; 1974-04-01 to 1977-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Lobar Coal Company → Chieftain #1; 1977-03-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Lobar Capital Inc → Chieftain #1; 1977-03-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Lobar Capital Inc → Lobar Coal Company; 1977-03-01 to 1980-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Chieftain Coal Sales Inc → Chieftain #1; 1980-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Curtis Rodney L → Chieftain #1; 1980-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis Rodney L → Chieftain Coal Sales Inc; 1980-10-08 to current/open; source msha-controller-operator-history