# Relationship history for MSHA mine 4404044

Current hierarchy: **Vandyke Leon & James Messer → Amaretto Mining Inc → Mine 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

- **controller_controls_mine:** Shelton Donald Lee → Mine No 1; 1975-02-11 to 1989-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Betty Lou Coal Company → Mine No 1; 1975-02-28 to 1989-06-20; source msha-controller-operator-history
- **controller_controls_operator:** Shelton Donald Lee → Betty Lou Coal Company; 1975-02-28 to 1989-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Amaretto Mining Inc → Mine No 1; 1989-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vandyke Leon & James Messer → Mine No 1; 1989-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vandyke Leon & James Messer → Amaretto Mining Inc; 1989-06-21 to current/open; source msha-controller-operator-history