What is Multiplier Fly Reel?

Martin Reel Company 72SR- anyone have any information on this? Found in dads garage can't find any good info online : r/flyfishing

Orvis Battenkill Multiplier Reel 7/8

sold VALENTINE 350 FLY REEL, SALMON, STEELHEAD, SALT-WATER MULTIPLIER - Classic Flyfishing Tackle

Hardy Featherweight Multiplier Fly Reel - Spinoza Rod Company

HARDY ZENTH MULTIPLIER FLY REEL — Fly Life Company

SOLD! – Hardy Marquis Multiplier 8/9 Plus Fly Reel with Spare Spool – $190 – The First Cast – Hook, Line and Sinker's Fly Fishing Shop

HARDY ZENTH MULTIPLIER FLY REEL — Fly Life Company

For sale here is an Orvis CFO IV multiplier fly reel in mint, unused condition. 1 2/3:1 multiplier gear for fast retrieve, 3 3/16 diameter, official

Orvis - CFO IV Fly Reel - Multiplier

NEW Multiplier Mooching Reel Review - GAME CHANGER

Canada Fishing Reels - It would be amusing to hear from the fly guys what they think of this adjustable drag, anti-reverse 10 wt fly reel I designed and made in the

Scarce Mint unused HARDY BROS “ Husky” Multiplier Silent Check Fly Reel - Antique and Vintage Fishing Tackle