ˈɜːli kəmpɹˈɛsɚz fɹʌm nˈaɪntiːnhˈʌndɹɪd θˈɜːtiːn ɹᵻpˈoːɹɾᵻdli dᵻlˈɪvɚd fˈoːɹ θˈaʊzənd θɹˈiːhˈʌndɹɪd fˈɪfti sˈɪɡ θɹˈiːhˈʌndɹɪd bˈɑːɹ, ɪŋkɹˈiːsɪŋ tə fˈɪfti ˈeɪt,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ sˈɪɡ fˈoːɹ θˈaʊzənd bˈɑːɹ baɪ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi ˈeɪt θɹuː ðə dɪvˈɛləpmənt ʌv hˈaɪpɹˈɛʃɚ tɛknˈɑːlədʒi.
Early compressors from 1913 reportedly delivered 4350 psig (300 bar), increasing to 58,000 psig (4000 bar) by 1948 through the development of high-pressure technology.