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electropneumatic
electropneumatic adj. 
/ᵻˌlɛktrə(ʊ)njᵿˈmatɪk/, /iˌlɛktroʊn(j)uˈmædɪk/ involving or relating to a combination of electrical and pneumatic power or operation.
Brit. /ᵻˌlɛktrə(ʊ)njuːˈmatɪk/
, /ᵻˌlɛktrə(ʊ)njuːˈmatɪk//ᵻˌlɛktrə(ʊ)njᵿˈmatɪk/U.S. /əˌlɛktroʊn(j)uˈmædɪk/
, /əˌlɛktroʊn(j)uˈmædɪk//iˌlɛktroʊn(j)uˈmædɪk/ΚΠ
1855 R. M. Glover Man. Elem. Chem. 34 Its [sc. ozone's] smell is precisely similar to what is produced when a powerful electro-pneumatic machine has been long worked.
1869 Musical Times Jan. 653/2 (advt.) Electro-pneumatic organ action.
1909 Times 7 July 19/3 The signalling is operated from an electro-pneumatic power box at Central Station.
1953 H. J. Hine Farm Workshop iv. 66 An electro-pneumatic switch closes the motor circuit when the pressure of the air in the reservoir has dropped to some pre-set figure.
2002 Cathedral Music Oct. 43/3 All new organs were provided with either tubular, electro-pneumatic or electric action.
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