# Relationship history for MSHA mine 2301785

Current hierarchy: **Brady D  Meldrem → Norris Asphalt Paving Company → NORRIS AGGREGATE PRODUCTS**

- 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:** Crane Company → NORRIS AGGREGATE PRODUCTS; 1978-12-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medusa Aggregates Company → NORRIS AGGREGATE PRODUCTS; 1979-10-01 to 1982-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Crane Company → Medusa Aggregates Company; 1979-10-01 to 1982-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Moberly Stone Company → NORRIS AGGREGATE PRODUCTS; 1982-11-22 to 1997-01-19; source msha-controller-operator-history
- **controller_controls_mine:** William C  Bruner et al → NORRIS AGGREGATE PRODUCTS; 1982-11-22 to 1997-01-19; source msha-controller-operator-history
- **controller_controls_operator:** William C  Bruner et al → Moberly Stone Company; 1982-11-22 to 1997-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Norris Asphalt Paving Company → NORRIS AGGREGATE PRODUCTS; 1997-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brady D  Meldrem → NORRIS AGGREGATE PRODUCTS; 1997-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brady D  Meldrem → Norris Asphalt Paving Company; 1997-01-20 to current/open; source msha-controller-operator-history