# Relationship history for MSHA mine 3607040

Current hierarchy: **Kaufman Bruce L → Neshaminney Enterprises International Inc → Rickard 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:** Neshaminney Enterprises International Inc → Rickard Mine; 1980-09-01 to 1982-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Doyle Judith A → Rickard Mine; 1980-09-01 to 1982-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Doyle Judith A → Neshaminney Enterprises International Inc; 1980-09-01 to 1982-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Neshaminney Enterprises International Inc → Rickard Mine; 1982-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kaufman Bruce L → Rickard Mine; 1982-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaufman Bruce L → Neshaminney Enterprises International Inc; 1982-05-14 to current/open; source msha-controller-operator-history