# Relationship history for MSHA mine 3606226

Current hierarchy: **Quality Resources Inc → Quality Resources Inc → Oliveri Pit No 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:** East Allen Coal Company → Oliveri Pit No 1; 1976-09-01 to 1977-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Liberto Lewis A → Oliveri Pit No 1; 1976-09-01 to 1977-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Liberto Lewis A → East Allen Coal Company; 1976-09-01 to 1977-12-18; source msha-controller-operator-history
- **controller_controls_mine:** De Knecht Abraham → Oliveri Pit No 1; 1977-09-01 to 1979-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Alky Bend Mining Inc → Oliveri Pit No 1; 1977-12-19 to 1979-10-30; source msha-controller-operator-history
- **controller_controls_operator:** De Knecht Abraham → Alky Bend Mining Inc; 1977-12-19 to 1979-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Quality Resources Inc → Oliveri Pit No 1; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quality Resources Inc → Oliveri Pit No 1; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quality Resources Inc → Quality Resources Inc; 1979-10-31 to current/open; source msha-controller-operator-history