# Relationship history for MSHA mine 0900264

Current hierarchy: **Melville A  Jamison II; Jeff  Avant → Atlanta Sand and Supply Co Inc → Roberta Mine**

- 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:** Atlanta Sand and Supply Co Inc → Roberta Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Curt B  Jamison  et al → Roberta Mine; 1950-01-01 to 2020-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Curt B  Jamison  et al → Atlanta Sand and Supply Co Inc; 1950-01-01 to 2020-06-01; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Avant et al → Roberta Mine; 2020-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Avant et al → Atlanta Sand and Supply Co Inc; 2020-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Melville A  Jamison II et al → Atlanta Sand and Supply Co Inc; 2020-06-02 to current/open; source msha-controller-operator-history