Specifications:

specialized adapter for NXP/Philips 87C451, 87C453, 87C552, 87C554, 89C739 and other in PLCC68 package
this adapter is suitable for manual mass-production programming
operating (mechanical) warranty of ZIF socket - 10,000 actuations
supported from PG4UW software version 3.22j
made in Slovakia
Ord. no.        70-3807
Socket        ZIF PLCC68, ClamShell type
Bottom        2x24 pins, square, 0.6x0.6mm, rows spacing 600mil