# Relationship history for MSHA mine 0201940

Current hierarchy: **James G  Bechtel; Zora R  Bechtel → CALPORTLAND COMPANY → White Cross 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

- **controller_controls_mine:** Lawanda  Bechtel → White Cross Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pinal Mammoth Gypsum → White Cross Mine; 1979-01-01 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Lawanda  Bechtel → Pinal Mammoth Gypsum; 1979-01-01 to 1986-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Pinal Gypsum Corp → White Cross Mine; 1986-04-15 to 1998-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Oren L  Benton → White Cross Mine; 1986-04-15 to 1998-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Oren L  Benton → Pinal Gypsum Corp; 1986-04-15 to 1998-04-26; source msha-controller-operator-history
- **controller_controls_mine:** James G  Bechtel et al → White Cross Mine; 1998-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pinal Gypsum Company → White Cross Mine; 1998-04-27 to 2003-10-14; source msha-controller-operator-history
- **controller_controls_mine:** James G  Bechtel et al → White Cross Mine; 1998-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James G  Bechtel et al → Pinal Gypsum Company; 1998-04-27 to 2003-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Zora R  Bechtel et al → Pinal Gypsum Company; 1998-04-27 to 2003-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Pinal Harvesting → White Cross Mine; 2003-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James G  Bechtel et al → Pinal Harvesting; 2003-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zora R  Bechtel et al → Pinal Harvesting; 2003-10-15 to current/open; source msha-controller-operator-history