Apollo Associates .. .. .. .. .. .. .. .. 607 Bolinders Company Ltd. .. .. .. .. .. .. .. 637 Brookes & Gatehouse Ltd. 620 Henry Browne & Son Ltd. .. .. .. .. .. .. 635 Castrol Industrial Ltd. .. .. .. .. .. Inside back cover Coastal Radio Ltd 629 Cogswell & Harrison Ltd. .. .. .. .. .. .. .. 635 C.Z. Scientific Instruments Ltd. .. .. .. .. .. .. 627 Dagenite Batteries Ltd. .. .. .. .. .. .. .. 635 Dell Quay Sales Ltd. 631 Gardner Engines (Sales) Ltd. .. .. .. .. Inside front cover Groves & Guttridge Ltd 643 Hattersley (Ormskirk) Ltd. .. .. .. .. Outside back cover Morse Controls Ltd. 645 Parsons Engineering Co. Ltd. .. .. .. .. .. .. 641 J. D. Potter Ltd 635 The Pyrene Company Ltd 629 R.F.D. Company Ltd 613 Strand Glass Company Ltd. .. .. .. .. .. .. 647 University Marine Ltd. .. .. .. .. .. .. .. 631 Vacuum Reflex Ltd. 629 Watermota Ltd 605 Yachting & Boating 629.