# Relationship history for MSHA mine 0201398

Current hierarchy: **E Kay  Perkins → Perkins Cinders Inc → Aztec plant**

- 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:** Reidhead Sand & Rock Inc → Aztec plant; 1950-01-01 to 2022-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Terrence  Reidhead → Aztec plant; 1950-01-01 to 2013-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Terrence  Reidhead → Reidhead Sand & Rock Inc; 1950-01-01 to 2013-07-31; source msha-controller-operator-history
- **controller_controls_mine:** E Kay  Perkins → Aztec plant; 1983-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jean  Reidhead et al → Aztec plant; 2013-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jean  Reidhead et al → Reidhead Sand & Rock Inc; 2013-08-01 to 2022-03-23; source msha-controller-operator-history
- **operator_operates_mine:** Perkins Cinders Inc → Aztec plant; 2022-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E Kay  Perkins → Perkins Cinders Inc; 2022-03-24 to current/open; source msha-controller-operator-history