# Relationship history for MSHA mine 3600152

Current hierarchy: **Daniel R  Hawbaker → Glenn O Hawbaker Inc → Central Valley Aggregates Whiterock Plan**

- 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:** Martin Marietta Aggregates → Central Valley Aggregates Whiterock Plan; 1950-01-01 to 1983-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Central Valley Aggregates Whiterock Plan; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1950-01-01 to 1983-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R  Hawbaker  et al → Central Valley Aggregates Whiterock Plan; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glenn O Hawbaker Inc → Central Valley Aggregates Whiterock Plan; 1983-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Glenn O Hawbaker Inc; 1983-09-28 to current/open; source msha-controller-operator-history