Need for help in purchasing spare parts for the oil refinery from companies such as GE, BH, BN

We want to buy spare parts that we will use in the oil refinery from companies such as GE, BAKER HUGHES, BENTLEY NEVADA, but we cannot find a contact person.

Can anyone help us with a direct contact details where we can get a quote on these products ?
Is there anyone who has been in the process of purchasing related products before ?

Such as: Baseboard, UCSB CONTROLLER,16 Port Ethernet IONet Switch, Protection IO, RTD, Analog IN/OUT, Core Analog, Turbin IO, PDM, Vibration, Discrete IN, Discrete I/0, RELE etc.

IS420UCSBH4A
IS420ESWBH3A
IS220PPROS1B
IS220PRTDH1A
IS220PAICH1B
IS230PCAAH1B
IS220PTURH1B
IS220PPDAH1B
IS220PVIBH1A
IS220PDIAH1B
IS220PDIOH1B
IS200TRPGH1BDE
IS200TREGH1BDC
IS200TCATH1ABA
IS200JPDFG1A
IS200JPDDG1AAA
IS200JPDHG1AAA
IS200JPDMG1ACC
342A4922P28V500DH
IS200TREAH2ACC
IS200SPROH1A
IS200SRTDH2ABB
IS200TBAIH1CDC
IS200TCASH1ACB
IS200TTURH1CCC
IS200TRPAH2AFD
IS200JPDMG1ACC
IS200TVBAH1AAA
IS200TBCIH1CBC
IS200TDBTH6AAA
P/N:369B1842G5001
P/N:369B1841G5001
P/N:369B1841G5002
P/N:369B1844G5001
P/N:369B1843G5001
P/N:369B1844G5002
P/N:388A2275P0222V1
P/N:369B1848G5001
P/N:369B1851G5001
P/N:369B1871G5001
P/N:369B1868G5001
P/N:369B1867G5001
P/N:369B1874G5001
P/N:369B1873G5001
P/N:369B1874G5002
P/N:369B1878G5001
P/N:369B1879G5001
P/N:3500/15
P/N:3500/22M
P/N:3500/25
P/N:3500/33
P/N:3500/42M
P/N:3500/45
P/N:3500/50
P/N:3500/53
 
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