HP part number cross reference?

Does anyone know of an online HP part number cross reference? I'm almost postive that I've seen one somewhere, but I can't find it now. I need to find the industry equivalents of the parts listed below. The 1810 prefix parts are probably just resistor packs (although the 16-pin ones could be RC networks or the like), the 1820 prefix parts are probably all 4000-series CMOS, and I'm guessing that the 1858 prefix part is an analog circuit. The T-28751 has a Motorola logo, but no other part number, not even an HP 4x4. I've occasionally seen other T-prefix parts in HP gear, but they seem fairly rare, and I'm not sure what the T signifies. I've tried HP PartSurfer, but it only listed one of the parts and didn't give any detail other than "MOS": http://outfield.external.hp.com/spi/ Thanks! Eric

part # pins --------- ---- 1810-0252 9 SIP \ 1810-0316 16 > Probably resistor or capacitor arrays 1810-0319 16 / 1820-0927 16 CD4028AF 1820-0936 14 CD4024BE 1820-0938 16 CD4027BE 1820-0939 14 CD4013BE 1820-0941 16 CD4043BE 1820-0946 14 CD4001UBE 1820-0949 14 CD4011UBE 1820-0970 16 CD4014AE 1820-1114 16 MC14516BCP 1820-1145 16 CD4049UBE 1820-1241 16 MC14512BCP 1820-1408 14 CD4073BE 1820-1466 16 MM74C174N 1820-1485 16 MM74C221N 1820-1514 16 MC14014BCP 1820-1578 16 CD4076BE 1820-1665 16 CD4099BE 1820-2037 14 MC14081BCP 1820-2080 16 MC14035BCP 1858-0038 14 Possibly a transistor array??? T-28751 16 ???