# Relationship history for MSHA mine 2101813

Current hierarchy: **Brenda L  Maki → North Central Aggregates → North Central Aggregates**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Range Redi-Mix → North Central Aggregates; 1950-01-01 to 1988-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Glen  Gutzman → North Central Aggregates; 1950-01-01 to 1988-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Glen  Gutzman → Range Redi-Mix; 1950-01-01 to 1988-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Brainerd Redi-Mix → North Central Aggregates; 1988-11-28 to 1992-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Gutzman  et al → North Central Aggregates; 1988-11-28 to 1992-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Gutzman  et al → Brainerd Redi-Mix; 1988-11-28 to 1992-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Roth Construction Company → North Central Aggregates; 1992-06-23 to 2001-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Roth → North Central Aggregates; 1992-06-23 to 2001-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Roth → Roth Construction Company; 1992-06-23 to 2001-04-03; source msha-controller-operator-history
- **operator_operates_mine:** North Central Aggregates → North Central Aggregates; 2001-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brenda L  Maki → North Central Aggregates; 2001-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brenda L  Maki → North Central Aggregates; 2001-04-04 to current/open; source msha-controller-operator-history