# Relationship history for MSHA mine 1302001

Current hierarchy: **Mid America Materials Company → Hallett Materials → Van Meter Plant & Pit**

- 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:** Hallett Construction Company → Van Meter Plant & Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald D  Kenyon → Van Meter Plant & Pit; 1981-10-21 to 1984-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Bituminous Material & Supply Company → Van Meter Plant & Pit; 1983-07-01 to 1984-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Ronald D  Kenyon → Bituminous Material & Supply Company; 1983-07-01 to 1984-03-08; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Construction Company → Van Meter Plant & Pit; 1984-03-09 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Hallett Construction Company → Hallett Construction Company; 1984-03-09 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Mid America Materials Company → Van Meter Plant & Pit; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Van Meter Plant & Pit; 1986-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1986-10-14 to current/open; source msha-controller-operator-history