# Relationship history for MSHA mine 0504537

Current hierarchy: **James H  Kirkland → Eastern Colorado Aggregates → HOLLY 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

- **operator_operates_mine:** Mid-Western Aggregates Llc → HOLLY PIT; 1994-01-01 to 1996-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Mid-Western Aggregates LLC → HOLLY PIT; 1994-01-01 to 1996-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Mid-Western Aggregates LLC → Mid-Western Aggregates Llc; 1994-01-01 to 1996-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Holly Rock Llc → HOLLY PIT; 1996-03-08 to 1999-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Grasser  et al → HOLLY PIT; 1996-03-08 to 1999-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Grasser  et al → Holly Rock Llc; 1996-03-08 to 1999-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Colorado Aggregates → HOLLY PIT; 1999-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James H  Kirkland  et al → HOLLY PIT; 1999-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James H  Kirkland  et al → Eastern Colorado Aggregates; 1999-09-24 to current/open; source msha-controller-operator-history