Photographer unknown2018-09-212018-09-21undatedhttp://172.16.52.76:80/cdm/ref/collection/coll8/id/233https://hdl.handle.net/20.500.12111/1289An unidentified man shown posing with a Heyrovsky Polargraph.B&WThis item is protected by copyright and/or related rights. However, for this item, either (a) no rights-holder(s) have been identified or (b) one or more rights-holder(s) have been identified but none have been located. Researchers are free to use this item in any way that is permitted by the copyright and related rights legislation that applies to their use. For more information, see https://rightsstatements.org/page/InC-RUU/1.0/?language=enImage