These push buttons are the ones that sit underneath the Hitachi Seiki membranes.
This membrane is used on several machines including the HS500, HS630 and HS800 with the Sigma 10M and Sigma 16M controls. Other part numbers that help identify this membrane are 9100-92-130-10 and SAE02999201305.
This membrane is used on several machines including the VM40III, VM50, VS40, VS50 and VS60 with the Lambda 10M, Sigma 16M and Sigma 18M controls. Another part number used to help identify this membrane is 9100-92-154-10.
This membrane is used on several machines including the VK45, VK45II, VK55 and VK55II with the Lambda 10M control.