# Relationship history for MSHA mine 2002736

Current hierarchy: **Daniel C  Timmer → Riverfront Sand & Redi-Mix Inc → Gillisse Pit**

- 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:** Leonard  Maas → Gillisse Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gillisse Construction Company → Gillisse Pit; 1985-09-01 to 1999-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Maas → Gillisse Construction Company; 1985-09-01 to 1999-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Gillisse Aggregates Inc → Gillisse Pit; 1999-10-01 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Steven  Maas  et al → Gillisse Pit; 1999-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Maas  et al → Gillisse Aggregates Inc; 1999-10-01 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Maas  et al → Gillisse Aggregates Inc; 1999-10-01 to 2004-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Daniel C  Timmer et al → Gillisse Pit; 2003-04-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Riverfront Sand & Redi-Mix Inc → Gillisse Pit; 2004-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel C  Timmer et al → Riverfront Sand & Redi-Mix Inc; 2004-04-01 to current/open; source msha-controller-operator-history