Contents:
- Datagraph (Charles Call) Ltd
- DatagraphiX
- Data Instruments
- Data I/O UK
- Data 100 Corporation
- Data Laboratories
- Data Logic
- Data Maintenance Ltd
- Dataplex
- Dataplus Ltd
- Data Precision (Equipment) Ltd
- Data Products Ltd
- Data Recall
- Data Recognition Ltd
- Data Recording
- Datamec
- Datasaab Ltd