Duct design calculator

Details Duct design calculator Duct design calculator

1985-06-19

1987-04-21

Zarfas, Louis S.

Printing and office machinery

Typewriter or calculator

Calculator

Patent

active

D02894149

REFERENCES:
patent: D256472 (1980-08-01), Sulek et al.
patent: D271025 (1983-10-01), Li
patent: D279381 (1985-06-01), Leung
patent: D283515 (1986-04-01), Li
patent: D284199 (1986-06-01), Li
patent: D285094 (1986-08-01), Li
patent: D286161 (1986-10-01), Wong

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