EJMA The Expansion Joint Manufacturers Association, Inc. Is an organization of established manufacturers of metal bellows type expansion joints. EJMA was founded in 1955 to establish and maintain quality design and manufacturing standards. These combine the knowledge and experience of the association's Technical Committee and are available to assist users, designers, and others in the selection and application of expansion joints for safe and reliable piping and vessel installation. Hans Kohn The Idea Of Nationalism Pdf To Word more. Are experienced and knowledgeable manufacturers that have demonstrated many years of reliable service to industry.