# Relationship history for MSHA mine 4104155

Current hierarchy: **Larry  Grothues; Alen  Grothues → M G Building Materials Aggr Div. LTD → M G Building Materials Aggr Div, LTD**

- 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:** Alamo Reserve Ltd → M G Building Materials Aggr Div, LTD; 2000-02-01 to 2003-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Stephen C  Miller  et al → M G Building Materials Aggr Div, LTD; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen C  Miller  et al → Alamo Reserve Ltd; 2000-02-01 to 2003-05-05; source msha-controller-operator-history
- **operator_operates_mine:** M G Building Materials Aggr Div. LTD → M G Building Materials Aggr Div, LTD; 2003-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Grothues et al → M G Building Materials Aggr Div, LTD; 2003-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Grothues et al → M G Building Materials Aggr Div. LTD; 2003-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alen  Grothues et al → M G Building Materials Aggr Div. LTD; 2003-05-06 to current/open; source msha-controller-operator-history