# Relationship history for MSHA mine 1300038

Current hierarchy: **Annabell  Lenz → Arcadia Limestone Company → PORTABLE #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:** Gendler Stone Products Company Inc → PORTABLE #1; 1950-01-01 to 1987-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Gendler Stone Products Company Inc → PORTABLE #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gendler Stone Products Company Inc → Gendler Stone Products Company Inc; 1950-01-01 to 1987-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Schumacher Sand & Gravel Inc → PORTABLE #1; 1987-05-08 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Schumacher → PORTABLE #1; 1987-05-08 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Schumacher → Schumacher Sand & Gravel Inc; 1987-05-08 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Annabell  Lenz → PORTABLE #1; 1990-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arcadia Limestone Company → PORTABLE #1; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Annabell  Lenz → Arcadia Limestone Company; 1993-04-01 to current/open; source msha-controller-operator-history