Mk. 1-1 1977

Mk. 1A 1977

Mk. 2 at EV Expo ‘78

Mk. 2 No. 1

Mk. 2 No. 2

Mk. 2 No. 3

Mk. 2 No. 4

Mk. 2 No. 5

Mk. 2 No. 6

Mk. 2 Battery Council International Convention and Exxon Dealers National Convention

Mk. 2 Philadelphia 1 ‘78

Mk. 2 Philadelphia 2 ‘78

Mk. 3 photo 1

Mk. 3 photo 2

Mk. 3/4 variable frequency and duty cycle controller with single power transistor.

Mk. 3a

Mk. 3b

Mk. 3c

Mk. 4-1

Mk. 4-2

Mk. 4-3