# Relationship history for MSHA mine 4604107

Current hierarchy: **Hardesty John R Jr-Larry A Myers → Avanti Mining Company Inc → Avanti #2 Surface**

- 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

- **operator_operates_mine:** H C Gregoire Inc → Avanti #2 Surface; 1974-01-01 to 1975-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Gregoire Harold C → Avanti #2 Surface; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregoire Harold C → H C Gregoire Inc; 1974-01-01 to 1975-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Mountaineer Energy Co Inc → Avanti #2 Surface; 1975-12-08 to 1977-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Mountaineer Energy Company Inc → Avanti #2 Surface; 1975-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mountaineer Energy Company Inc → Mountaineer Energy Co Inc; 1975-12-08 to 1977-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Avanti Mining Company Inc → Avanti #2 Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hardesty John R Jr-Larry A Myers Et Al → Avanti #2 Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Avanti Mining Company Inc; 1977-08-01 to current/open; source msha-controller-operator-history